Look at the online catalog at www.hostelshoppe.com for a fairly comprehensive
listing of a variety of different models. Bents are adjustable over a fairly wide range and come in several sizes, 6'4" is not a problem. Burley (the tandem folks), Haluzak, www.rotatorrecumbents are some other makers. www.bentrideronline.com
is an online magazine that comes out 10-12x/yr and has a lot of reviews and has
had all issues for past ~3yrs online, but last time I looked the link to old issues was
not where it used to be, so a search or inquiry may be needed to find it. The site is free and has a BB also. Steve