If your going to grow several acres of vegtables,there are spurts of pretty intensive work, with the weather a big factor. Timing is a big factor. I would consider two tractors--kind of like two hands are a lot more than twice as productive than one. Many jobs entail using several implements and changing implements back and forth, sometimes several times a day, like plows,tillers,sprayers bedders, spreaders,planters, wagons etc. Certainly 4-wheel-drive, creeper range/HST and some hydraulic capabilities on one unit would be handy. The second unit unit should be the same width, perhaps with a front end loader. Peronally I would not buy a compact tractor that was only two wheel drive, especially in a situation the puts you in a field/garden in the spring. I'd consider a new/used or used/used combination. This could give you some leverage with a dealer with implements thrown in. Also that 2nd tractor is handy to pull the other one out of that wet spot! Many times, getting multiple vegtable crops planted in a timely fashion before rains keep you from getting into a field, especially with some vegtables that are cold hardy and therefore planted early, is a key to success. Two tractors between 25 to 35 horses with a mix of ag and R4 tires may be your best bet( be careful; some R4 rims don`t allow you to adjust tire width) Buying the right thing the first time is usually the cheapest way to go. Don`t worry too much though, compact tractors have good resale value, at least if you stick to the major brands.
RCH