I've always liked the 73 to 87 K- series Chevys. They're everywhere, so the prices are usually reasonable and parts are easy to come by. These trucks are also easy to work on, more so than the 88 and up IMO.
WELL THE ONLY THING I CAN SAY GOOD ABOUT A 2 WHEELER IS THAT THERE IS LESS PARTS TO BREAK, AND THEY CUT BETTER DOUGHNUTS IN THE SNOW. GO WITH THE 4X4, AND DONT LOOK BACK, TWO WHEEL DRIVE IS FOR CARS. DONT WIMP OUT WITH A 1/2 TON EITHER GO FOR THE 3/4 OR 1 TON, BIGGER IS ALWAYS BETTER AND TOO MUCH ALWAYS BEATS NOT ENUFF