you've linked to bikes varying in size from 53-57cm. Make sure you figure out what size you want first, then look at bikes.

Secondly, if this is your first bike, I would do something on the cheap. I agree about building up the Panasonic/Shwinn frame and learning as you go - but don't pay more than $50-60 for that frame. Those pistas are a rip-off, in my opinion (for that price, not the bike in general)