Rose17, have you found a local bike shop that you can trust?
you intuitively hit the first nail on the head: fit!
the bikes you are looking at are all good bikes. the question really comes down to fit. If the shop offers a fitting and is wiling to put the cost of the fitting towards the purchase of a new bike--it is well worth it!
Also, if you haven't ridden in a while: factor into the cost of the bike the following items: helmet, a good lock, ankle reflectors and a rear blinky light (for commuting), a messenger bag (can get them used--sometimes posted here, or your local craigslist or e-bay) or backpack.