i dont know about the dif lock for tilling, i cant see it being a big issue. i only wish i had it for a few pretty good hills, which im hoping i took care of by adding wheel weights. im not seeing the dif lock being huge for tilling. guys have done it for years without. if the snowplow isnt an issue, id snap it up. you might even be able to sell the 48" deck and buy a used 54 without taking too much of a hurting. i LOVE cutting with my 3185. the power steering makes going around trees a breeze. you arent going to get a better grass cutter. im trying to find a used plow setup for mine, but its slow in the making. sounds like 3k for a 3185, bagger, weights, bracket, 3ph, and tiller, and a winch, and plow, thats a good deal. id definately be looking at that very hard. throw 2500 cash at them and see what they do though. even if the 3k is firm, id still take that. these are nice tractors for the money. depending on how hard on it the p.o. was, you wont regret it.