All the major, and many of the minor, brands have good machines. I own green, and have been very satisfied, but the others offer great products. To me, the dealer is the most important factor. Good support means a lot and can make a good tractor a great investment. Conversely, a weak dealer can ruin a good tractor. Even among the major brands, there is a lot of variability between the dealers, so shop carefully. With regard to tractor size, I had a 4310 and 3720 John Deere, before trading to a 4520. The mid frame John Deere's weigh about 3000# without ballast, and neither the 4310 nor the 3720 compacted the ground when mowing, even on soft ground with R4 tires. My dad has a 335 garden tractor and if anything, it left more track marks on the ground than the larger machines. It will be interesting to see how the larger framed machine I have now does, but I suspect it would not be much worse. With regard to 2000# machines, you should be fine.
John M