You should probably also see if Thom at The Whistle Shop (www.thewhistleshop.com) will tweak you a Clarke C. His Tweaked Clarke Ds are really nice.
Also agree that the Susato C is a great whistle I’ve played it in concert before with a full band backing me and it just sounded killer. The tone is totally different than a Clarke obviously… You definitely can’t go wrong with the O’Briain Eb… I’m trying to get them to make some Cs.
Sorry, didn’t mean to lead people astray.
Tom
Nobody has mentioned them so far, but Syn whistles are currently available in a Eb, D and C combo. Cost is $55 posted.
Yes, but are they any good? 
Sorry, i couldn’t resist!
g
Glauber,
The Reyburn brass C (model BR or LB) is a fantastic whistle. (The D/C combo is very nice, by the way…both whistles are great, but it’s the C that shines.) It posses a full, interesting and beautiful tone with sweetness in the second octave. It plays fast, too…ornaments pop nicely. People complain that C is a bland key, but not so with the Reyburn!
www.reyburnwhistles.com
Best,
Micah
Here’s cheap tweak for a cheap whistlle. On my Clarke Sweetone C I took a bandaid and wrapped it around the top 1/4 part of the first whole. This brought the C# down in pitch, but also made the Cnat oxxooo fingering ok for general use.
Jeff
I’m really partial to Burke Composites and the C has the same sound as the others. I’d like to try the Overton like Loren’s. If it’s anything like my easy blowing Bernard Overton Low F it will be fantastic.
If you can find a Walton’s Golden Tone you’ll have a nice C. (thanks again Philo)
So many whistles to try and so little time and money. So many tunes to play and so little time… but the Abells that came in about the first of the year have spoiled me. I keep trying to persuade myself that I don’t need all the Burke composites I have since I received the Abells but then I play the composites and there goes that idea to get money to feed my whistle habit. I guess I’ll just have to go ahead and buy more Burke composites to make up for my failure to sell the ones I do have. :roll:
I know it’s just a matter of preference but I’ve had Burke AlPros in high D (still have that one but it’s on loan), G and low D. I no longer have those but I do have composites in those keys plus some others.
jim
OK, thanks for all the suggestions.
For now i’m buying the O’Brian Eb and the Oak C.
But the Reyburn! Man oh man, one day i’ll be getting one… 
I recently got the Reyburn D/C set (from Micah, incidentally), and I like them a lot, particularly the C. There is a very satisfying fullness and almost a growl to the tone. Very well balanced, plays sweetly and easily, and looks very good.
Just an observation or two from a maker…
I used to use the same tube diameter for C as for D, 0.545" ID. I always had the devil of a time getting the C to be stable, especially in octave shifts, and around the bell note. I’m an experimenter, as are all us makers (we love to play with designs, much to the dismay of our spouses, sometimes), and what I discovered in my play is that 0.67" ID tube that I’ve been using for low A and B-flat whistles, works very well, indeed, for C also.
Another item of interest I learnt from observing Stacey O’Gorman’s Alba whistles, is that a narrower (longitudinally) window, seems to improve both volume and stability in whistles “on the edge” where tube diameter is concerned. So when you look at Serpents, and see the seemingly odd breakout of tuning to tube diameters, well, now you know why!
serpent
glauber, can’t comment on an Eflat as I don’t have occasion to play one, but you definitely can’t go wrong with an Oak C. I absolutely love mine!
~Larry
Yesterday the box arrived from thewhistleanddrum (thanks McChastain!) with my Oak C, O’Brian Eb and a gift! A free Mel Bay book of tunes. Oh wow!
Ok, Oak first: solid sound, bell-like on the lower notes. Not jaw-dropping, but a solid whistle.
Now the O’Brian is something else! It’s a Frankenwhistle, made of a Generation tube and a tweaked Feadog-like fipple The tweaking consisted of filling the gap in the plug with putty and completely re-doing the voicing. The best part is the label: 2 strips of gold label of the kind you do with a portable labeler, saying O’ Brian Improved, glued strategically to cover the “Generation” logo but leaving the Eb showing. 
Priceless!
Sound: more chiffy than i normally go for, but the chiff complements this whistle well. Extremely agile (probably in part for being an Eb), this thing wants to fly. Takes very little air. Really pleasant sound, not loud, but distinctive. Great whistle!
g
My Eb and C Sindts are mindblowingly good… I’d say the Eb is the perfect Eb whistle. Neither have the cross fingered C natural problem (only the D has that). I’ve owned a LOT of whistles and this is about as good as it gets.
Chris
Has anyone tried a Burk or Reyburn Eb? I am a little currious as to how they compare to some of the ones mentioned so far.
The Burke C goes for $110 at Song of the Sea, and they are in stock.
Yes, Chas, I do love my C! It has great tone, nice and stable on the bottom, everything a Burke should be. For the record, I had a composite C and wasn’t thrilled with it. The Burkes were my first high enders, and frankly they’re still my faves, especially among the metals.
The Elfsong C is nice enough, and the range of color options is spectacular if that matters (and honestly sometimes its cool to play something that looks so. . .so. . .candyish! I get oodles more attention when I play the Elfsongs in public than I do with ANYthing else).
Now I’ve never tried a wooden C yet…but I’m waiting on my Abell which should be here any month now. Chas, do I have YOU to blame for the need to order that one??