Join Date: Nov 2006
Location: Manhattan, KS
Bikes: '10 Fuji Cross RC, '09 Specialized Tarmac Pro SL, '0 Gary Fisher Paragon, IRO Model 19
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alright....here is the scoop
I am just shy of 6'3, arm span of 6'6, and inseam (pant size, not 'measured' inseam) of 34in. So I am built similarly to you, only with longer legs
I have an '07 paragon (19in frame) and love it. The deal with the pre-2008 GF geometry was it was designed to fit people with longer arms/torso, hence why it fits me so well. Go into your LBS and have them fit you to a 29er (both old and new) to find out if you will need that 21in frame.
As for the frame, the only difference from the Paragon down to the Cobia is the color. They are all great.
The jump from X7 to X9 is like jumping from 105 to Ultegra SL. I've found the X9 is a lot smoother and a little lighter (but I don't care so much about saving weight)
any other questions, PM me or email me. I'd be happy to help you out.