The 2009 Jamis Coda Comp has the better configuration of the bunch. And the 2010 Coda Comp is better configured than the 2011 Coda Sport. So if you can get a good deal on a 2009 Coda Comp in good condition that is where you should invest in my opinion. A 2010 Coda Comp in good condition for $550 should get serious consideration over a new 2011 Coda Sport for $600.
I would be a little hesitant about any Cl sale. One person's definition of "good" may be different than yours. "funny things" can sometimes happen in shipping. I like the LBS concept better. If you are unsure about the specs involved, would you really care about the difference? Wouldn't it be the safer bet to get something brand new that has a local store behind it for support? That said, I really like the Coda line and I don't think you can make a bad choice here but just think long term.
The standover on the 21.5" 2009 Jamis Coda Comp is 32". I'm 5'10" with a 30-31 inch inseam and the 19.5" (31" standover) works well for me. So if you have an inseam of at least 32-33 inches a 21.5" might be OK.
I am 5'11" with a 32" inseam. I bought my 2009 Jamis Coda Elite online. I was very nervous and called several Jamis dealers. They all recommended the same 19.5". I must say that with the bicycle fitting instructions that I found on the internet that I have no issues at all with the size after making the adjustments. Now only if my behind would adjust to the seat. The only negative that I can saw about the bike is the quick adjust seat clamp. I am not a fan. I also want a non-suspension seat post but honestly the travel is so slight that it isn't high on my priority list.
Honestly thought, the bike is very fast and smooth on roads and bike trails. I put on a pair of A530s since I can clip in or not with those pedals. Now I just need to decide on the Ergon GCS bar ends or the cheaper bar ends that I saw in one of EsoxLucius's posts.
I also need to get pictures of the bike up in the picture thread.