Make certain that these bikes are made of chromoly steel and not hi-tensile steel.
OR ELSE THEY WILL EXPLODE!
No, not really.
Find a bike that fits you. If you aren't comfortable, you won't want to ride. Find something either in a good state of repair, or something within your "comfort zone" of needing repair (budget, mechanical skill, etc.) Be prepared to spend money, or compromise. It's just a bike, not heart surgery, don't sweat it.