Brian -
For my uses, the Class II tractors are just right. One of my primary requirements is that the tractor be able to fit through my 6' gates. The TC33DA with R4 Industrial tires is 62 inches wide at the widest point. I also have my fences set about 6 feet off the property line, so I have room to get a 60" Bush hog along the outside of the fences to keep the brush from taking them over. I do have to fold the ROPS on the TC33DA to get it through my gates. I didn't have to on the 1520 I had.
You really need to try to make an honest assessment of what you need/want to do with the tractor. Bigger is not always better. If you are finish mowing a lawn, the larger Class III tractor may cause more ruts in the lawn, and won't be as manueverable around obstacles or in the woods. However, if you have plenty of room, and need to take larger bites with the FEL or want to use a larger bushhog, then the larger tractor may be just the ticket for you. I will admit, though, that I got the most horsepower I could get in the Class II, so it would lift heaver loads and not run out of power when box blading.
The TC35DA only has a couple more horsepower, but the heavier chassis and larger wheels, combined with proper gearing, will allow it to move larger loads or finish jobs in less time than the TC33DA.
I don't regret my decision at all, but you need to decide what you need the tractor to do for you.
Good luck again on your search. I know it is tough to decide, and it could be pretty expensive if you decide later that you made a mistake and want to trade up (or down) in size. /forums/images/graemlins/confused.gif /forums/images/graemlins/crazy.gif