Most of those bikes are going to be too big for you. You are going to need something around 56cm. The Norco, Nakmura are 62-62 cm The Blue bike is about a 58cm and you might get away with it if you have long arms.. The appolo is probably a 52cm and may be too small unless you have short legs.

That leaves the Green bike and while that might be a good bike to restore with the wingnut wheels I think I would pass on it for a dedicated commuter. I'd look for something mid to late 80's. That is mid 60's I would think. Mid 80's is when 700c started to be the norm and a lot better tire selection these days.

For the prices you are stating that guy is flipping bikes. If he is putting new tires on them and doing a full service the prices may be in-line but a lot of those bikes look in as found the condition with old tires and I pick up for $10-30us before tune up and new tires. You take that to a bike shop and get a tune up and tires expect to drop another $100-150.

Too bad you are not down here. I just picked up a SWEET 1988 Trek 360 to flip that would be about right size for you. With tires I'll be asking about $150us.