Save your money and buy a used 1 or 2 bottom plow and replace the plow shares with the Weiss plow parts referred to as the deep conservation tillage plow shares- sucks down to 14 inches and leaves no hard pan every year.
then you can buy a small tiller if you want but a three point heavy toothed disc will probably be all you want.
you could buy the small hydraulic powered rock picker from equipmentland.com and pull a lot of rocks out with no manual labor.
The 48 inch unit has a hydraulic bar grate pick up unit and hopper and is sized for your HP bracket.
getting into a big tiller is pricey and a rock picker will save you hours of time and labor, its something to think about anyway as the rocks will still be there no matter the tillage method.
