I've been waiting for someone else to answer, but given the size of the property I'd suggest something in the 24 to 30hp range. You want a budget tractor, and you are new to tractors.
So from my perspective, I would suggest something from a major brand player because they are safe bets for parts, service, local dealerships, etc. And because you are new, I would STRONGLY urge you to look at a hydrostatic transmission (HST, HSD). In the 30hp range, the New Holland TC30, the Kubota
B7800 and I think the JD 790 are all considered "value" tractors without having lots of whistles and bells, but all are solid machines. I know the TC30 and
B7800 are availabe with hydro transmission, but I don't know about the JD for sure.
You could step down a little in size, if so, the Kubota B2610 would be a nice choice, also a value oriented machine without all the features.
Again, I am only recommending tractor that have an HST transmission for you and I strongly recommend it for anyone new. You say you have hills, well HST is MUCH safer on hills, again, especially so for new users. And it is more convenient to use too.
I believe Kioti is coming out with HST transmissions in their 25 to 30 hp range machines, in some regions Kioti is prices lower than the major 3 brands, in other areas it is right up there in price witht he big 3. Kioti is considered a minor brand, but it is growing rapidly and the dealers are typically solid dealerships. As a newbie, you probably want to stick with a tractor that has a very good dealer standing behind the machine unless you want to get out and wrench the tractor yourself. Personally I don't.
Many of the minor brands are solid tractors, but many do not offer HST, or do not offer smaller tractors and it doesn't sound like you want a big unit (nor does it sound like you need a big unit). Also, some of the really low end units (Jinma/Farm Pro) make a decent work horse machine but doesn't offer HST, and dealerships are often of poor quality that are more concerned about selling tractor than fixing them (totally depends on the dealer in your area!).
So my first choice would be something right at 30hp. Second choice would be something a little smaller (24-25hp). HST only. R-4 tires, they are good for mowing, good for loader work, not great for either, but a turf tire is terrible for loader work and an R1 is great for loader but terrible for mowing. R4's are a compramise. You'll want a front end loader for hauling out the trees, etc. A mid mount mower might be easier for you, but it is more expensive than a rear mower, so for budget purposes, a rear mower on the 3pt hitch would save you money. On mowers you get what you pay for, buy cheap and replace it every 5-7 years, buy good and it will easily last 15 years.