Is there likely a handling different between the two sizes? My only other worry, which a couple of you have already noted, is the change in seat height. I THINK I will be able to touch the ground. I guess I can swap a 700c on just to size and see...

Sounds like I will be going 700c after all. Hmmm... it will bump up my BB height a pile, but I want that... more speed!
Thanks for the help.