Hi everyone,
I want to start biking to work, both to save some money and to get myself fitter. I have not ridden a bike (for any significant duration) since highschool. Hence I am a complete novice to biking.
I live in Philadelphia and have a ~6mile ride each way. The terrain is fairly flat except for a hill near my home (about 1/2 a mile).

Since I have no idea if I will stick with this in the long run and due to monetary concerns, my budget is just $300-350.
Reading through the forum, it's clear I cannot get anything fancy for this price. So I thought of buying online from amazon/bikesdirect, but most forum members do not recommend it.

So with more time on the internet, I found some bikes at Performace Bikes (there's a store in Philly and I can ship site to store), which fit my budget.
The comparison page is here : Performance Bike - Road Bikes - Product Comparison

What would you guys recommend, considering my budget and requirements? I would appreciate any and all feedback.

Thanks alot!!
Dan