Congrats on the new toy/tool!! Having a nice little tractor is a huge bonus for a hunting landowner.
In my opinion, that's plenty of tractor for small plots. I agree with Strut10 on the 4' hog. In addition, raising a heavy 3pt tiller on sloped ground can make for some uneasy tractor driving, so be careful how wide you go with the tiller as well.
We have a tiller for our plots....rocks are a pain when using it. We have so many rocks that if I don't hear rocks banging off the back shield, I have to turn around and make sure it's still running. It's hard to beat the job the tiller does for seed bed preparation. A few weeks ago on September 20th, Dad and I finally got our oats/barley/clover mix planted. I had previously sprayed most of the areas, but one still had a fair amount of Japanese stilt grass growing in it.
On the sprayed areas, I broadcast the oat and barley seed prior to Dad turning the top over with the tiller. Unsprayed area - he mowed as low was he could with the bush hog....I broadcast the seed and he tilled lightly. Once he had the grain seed tilled in, I came through again and broadcast the clover and a little bit of alfalfa seed on top of the seed bed. Ideally, we would have run the cultipacker over the seeded areas, but it was pretty wet and some of the terrain is barely friendly enough to get it tilled...so we let the rain set the small seeds for us. Obviously rainfall has been on our side, but the plots came in beautifully.
What are your plot areas like? Soil, rocks, slope, access, etc?