Check out this kickstarter project. It looks like a Makerbot but with more table space and open air. The kit is going for $500 and $900 for an assembled version. I recommend getting an assembled one. I really wish I had held out on building a 3D printer. With the prices dropping on these kits an the specs getting better, I think I would have been better off.
http://www.kickstarter.com/projects/1650950769/rigidbot-3d-printer