I'd buy a zion printer. The guy who makes them prints the frame on a giant printer he built himself. It's less than $500, has an 8x8x8 inch build volume, with the option to expand the z axis, has a J-Head hot end (which means you can do many more filaments besides ABS and PLA) and it has .05 mm precision.

http://makergeeks.com/mazi3dpr.html

Best value if that is the price range you want to stay in.