I bought this truck new in 2002 and besides a replaced power steering pump (under warranty) I have had no mechanical issues. Toyota quality is second to none. Only gripes I have is the placement of the clock, and a jittery ride over bad pavement, and mediocre gas mileage (18 mpg avg.) but hey, its a truck. Stock tires were crap and after replacing them with bridgestone Dueler A/T Revo's the handling improved greatly. This truck has never let me down, and I'll probably have it forever. Its still as solid as the day I drove it off the lot. It always pays to have a great pickup.
Size. Its much easier to park this thing than a full size chevy or ford or even tundra.
New tires hands down. Maybe add the TRD supercharger. I would if I had money to blow.