I'm looking to upgrade my 2004 Trek 1200 and have so far come across:
2012 Trek 2.1 - discounted to £900 from my LBS
2011 Cannondale CAAD 8 105 - £815
2012 Focus Variado 2.0 - £694
I'd probably cope with Tiagra (thats what's on my current bike) but most of the Tiagra spec bikes don't seem much cheaper.
Main reasons for upgrade are: existing bike is a 58cm and is a bit too long for me (TT is 575mm and I have to slide the saddle all the way forward) and everything on it is getting a bit shabby. (it was bought SH off Ebay in 2008)