Both nashbar and performance have some great deals on quality bikes. Before my current one I had a nashbar that was actually a Fuji but cost half as much.
Also you can get some great unbranded frames by eBay from China. My brother got a carbon fiber racing frame made in the same factory as some famous brand, I forget which, but he spent 400 plus 150 shipping for it, but said the same frame branded would have been 2000