Rivendell Atlantis, Rivendell Rambouillet, Co Motion Big A,l Klein Adroit
Spicer Cycles. They are a bike shop located in Indiana. The make their own line of highly affordable frames: mountain, road, cross, bmx,etc. They also carry the full Surly line of bikes. Good people, great service. http://spicercycles.com/
Nashbar has a new CX frame and fork for ~$280. They also have a CXP-22 wheelset for $120 with disc hubs. You could put a complete bike together for as little as $600 if you get the lowest-end stuff. The catch is that you'll have to build it yourself (or have your LBS do it).