I commute on a 2006 Scott S50, and i cant fault it.

The only thing i would change on it if i was going to use it as my main bike would be getting 105 on it instead of the stock sora - also, the brakes on it are horrific - kool stop salmons are a must, for a first road bike its a great choice though - as long as it fits well, it doesnt really matter what it is as long as you ride it lots. Speak to your bank manager about the future too, once the bug bites, it only gets worse...

Shorts are one thing you should not do cheaply - a good pair of bibs will be your best ever bike purchase