Check your local Craig's list for something used if possible. I've seen many of them on E-bay, but none of the sellers ship due to size.
I now have a used Sears 5HP front tine tiller I got used about 4 years ago for $125 and it works just fine for my garden. My plot consists of 5 rows 45 ft. long and a couple of side beds in the 20 ft. length near fencing. I would not want to break new ground with this tiller though. It would work you to death getting through tough sod and heavy soil.
My first tiller was a used 8HP TroyBilt I got for $400. That was a great deal since it had forward and reverse drive gearing and was a rear tine counter rotating tiller. It cut ground very easily. Too bad I lost it to Katrina's flood waters in 05 or I'd still have it. To replace that with a new tiller would be close to $3,000 now---------too rich for my blood.