Thanks for the replies fellas. The area I will be working on is 5 acres. It's rectangualr in shape. We are building a motocross track and I have about 400 truckloads of dirt there now. The soil is for the most part black dirt. There are some sandy areas but mostly just black dirt with weed growth on top of it. It is also pretty flat.
I have been moving the dirt around, building jumps, etc with a John Deere 450C track loader that has a 4-1 Drott clam bucket. You can open the bucket which turns it into a dozer. I attempted leveling off some areas but wherever the ground dips the blade dips too and makes some really jagged and hard bumps. Even with the blade in "float" mode it will do this. I am not an expert operator by any means but I just acquired a nice little 1971 Ford 3000 tractor that is diesel. Before I spend my money I want to make sure I'm spending it on the right attachment(s) that will accomplish what I need it to do which is (A) track maintenance, tilling up and smoothing out rutted areas, grooming the course and (B) leveling out "humpy" and rough areas. Also when I manuever the track loader it tears the ground up pretty bad.
My tractor has a 43 hp PTO.
Thanks again for your time and recomendations for attachments!