This year I'm asking for a bunch of little crap. A lot of sensors, filters, etc. But I'd say the big ticket item would be a couple gallons of lizard skin (both sound and heat insulating) and a crap ton of dynomat.
Other than that, I already put new wheels, tires, transmission, driveshaft, and a bunch of other crap on the rover. For the first time ever, its actually in pretty good shape.