I got that little HarborFreight 4x7. Way too small to do any serious gun smithing, but it works quite well for what I do.
http://www.harborfreight.com/cpi/cta...emnumber=39743
This one looks to be in your price range:
http://www.harborfreight.com/cpi/cta...emnumber=46199
Just remember to disassemble, wash down and lube all moving shafts, gears and such before using it. They have a history of coming in with machining / casting grit in the guts, whether from HF, Grizzly or whomever.
Pops