I would get the TCR3 and never look back. It fit you well, you liked it a lot. When you are out riding 30 miles, basically sitting in one spot, the fit is very important. Also, as the miles pile up, you'll really appreciate a well-riding bike. Plus, you'll be riding much further than 30 miles.

But if you are really worried about the money, go out and test ride a lot more bikes. Not only is it free, but you pick up more valuable information and can be saving more money in case you do decide to go over $700.