Rob the rototiller would be great but have you priced them?

A disc and a plow are a fraction of the cost of the roto tiller.

You can find used stuff if you look around. do you have a box blade?

Here is a link you can read up on roto tillers here and you can even get a better idea of what equip might suit your needs.
http://www.tractorbynet.com/forums/index.php