It's always a big decision when you are buying a new bike. I went through a lot of research and mind changing last year when I was buying a new bike. I eventually bought an Allez specialized, I didn't intend to buy an Allez, but after trying out a lot of different bikes I found it fitted me perfectly and I loved it. You need to visit a few bike shops and try out some bikes. At the level you are looking at the quality of the bikes will all be good. It all comes down to personal choice.