Darren is right,
You are going to out grow a little tractor FAST, so unless you plan to trade up fairly soon, you better aim higher!!! If you limit your self to a 4 foot rotary cutter (brush hog), you will wish you had bought a bigger tractor as soon as the "new ness" wears off!! I wouldn't even consider a BX.
If you want to save some money, get a gear drive trans., it puts more HP out the PTO than a same size hydro, and once you get use to it, you won't care that you have to shift it!
Personally, i'd be looking at 35 to 40HP Ag. tractors. They come with things you will be paying more for on a compact, and they will take a lot more abuse, and out last a compact easily.
BTW, you "can" buy a rear mounted snow blower that you pull. Yes, you drive through the snow, and then the blower picks the snow up, and blows it away. They are a very well built blower, and you can leave your loader on while you are blowing snow! They come in many sizes, even big ones for Ag. tractors.
Robert