IMHO, you'd probably be best served with something in the 40 to 50HP range. That should keep you in the CAT I 3-point hitch class, where implements are reasonably priced, more readily available, and still sized to handle that sort of acreage.
Stay "modern enough" to get Live power/live hydraulics. Personally I like 'em diesel. And I prefer (for daily users) tractors with wet brakes. Power Steering is a given. More modern tractors (say, 1970 on) will USUALLY handle a loader better than older tractors, but that can vary. If I only had ONE tractor, it would have a loader. Handiest thing since the invention of the shirt pocket.
Every brand has it's stars. Every brand has it's lemons. And buying used, you aren't buying the legend of an old tractor from back in the day, you're buying something that just might have loads of torturous hours in the hands of an abusive owner. So with that in mind, keep options open as far as what's the best buy.
Some people tend to see tractors with blinders on. They only see brands/colors they're familiar with. I've got Red, green, blue, red and grey, orange, and a yellow one....Can't honestly say any one brand stands out as the best in every instance. Keep that in mind and you'll prevent putting yourself in a box.