i was checking 2009 bmc roadracer sl01, which is exactly the same as the 2010 version, and its a very nice bike. weighs about 16.5lbs (without cages and pedals) for $1700.
or specialized allez with apex. the frame itself is really nice and you can definitely upgrade later on.
caad9 (if you can find one in your size) or caad10. you can spend about $1500 for a caad10 with full 105 (5700). i havent heard much from the caad 10 but definitely cant be bad. only downside is that theyre made in asia instead of the usa. maybe wait a lil longer till spring comes along.