There is nowhere really centrally located for all three of those bikes. I'm assuming you mean to take them there separately, correct? It wouldn't be very fair to the other shops that don't appraise the winning bike if I did it that way, would it?
They should all fit me. I'm about 6 1, and I was told I needed a bike about 58-60 cm. That's what I've been looking for. I'm really hard to be found "uncomfortable". I mean, I'm on a 50 cm bike now, and I wouldn't call it uncomfortable at all. I'm just worried that my knees won't love me if I stay on it too much longer. But, even with that said, I'd like it to feel comfortable to be on
Edit: about how much would it cost to upgrade to a 10 speed cassette? Would i need a new derailer, shifter, and cassette, or just a cassette?