You will be making a step up in quality of musical instrument, most noticed in range of expressiveness, responsiveness and capability to vary the tone. It will be easier to play in the second octave also because of the conical bore. Your embouchure will need to be a little different, and that varies from flute to flute.
Go for it, you’ll have a blast! But, be forewarned, there’s no turning back once you’ve experienced the conical bore flute. Your entanglement with the flute only gets deeper and more involved!
Get yourself a WFO (wooden flute obsession) cd or two (1 and 2 are available, each a 2cd set), and start listening to the tracks (which are mostly solo) to see what these flutes have to offer, if you haven’t already. The simple system flutes are basically all the same in construction, but the difference in tone between players is amazing. Here’s the link for the WFOs: http://www.worldtrad.org/ By the way, there are samples on the webpage, artist links, flute played info, etc., all put together by Chiff member Kevin Krell. Can’t recommend better cds to hear the tone of the flutes, and some great tunes too.
You will no doubt appreciate the differences in the conical bore flute, but there isn’t really a need to go high end to start with. A flute like Casey Burns Folk Flute at $275 will get you where you want to be, and will keep you happy for some time to come. Even accomplished fluters can appreciate the Folk Flute, and do. Here’s his website: http://caseyburnsflutes.com/
Added: Or, if you want something less expensive, although not a true conical bore, it’s darn close to the response, tone and just as fun, one of Doug Tipple’s pvc flutes. The finger spread would be more on these, like your Olwell bamboo flutes. I can overwelmingly recommend the speckled bore flute with the wedge, and others have been touting his other flutes on Chiff for some time. You can save some big bucks too!
Here’s a couple links-my review of the speckled bore, and then Doug’s website:
http://chiffboard.mati.ca/viewtopic.php?t=31068
http://home.earthlink.net/~life2all/dougswebspace
Good luck on your journey, it’s a worthwhile tiptoe through the tulips!