It really depends on what lift you go with as far as cost. I'd say the lift can be had for around $1k from PRG products. I had 18's on my '12 with a leveling kit, but I had 33" tires on them and they were much wider than stock. I don't think (opinion) that a T with a 4" lift on stock wheels would look good. You may be able to make it look decent by getting some bigger tires and some spacers to kick the stance out a bit wider (may have interference with the wheel wells with too much spacer!). I would start by looking at the complete lifts on the PRG site and go from there. I have a 6" pro comp (very easy to install and complete setup) but if you ran stock 18's on it it would look ridiculous. You should also consider the impact of a lift on your drivetrain. You may want to look at a driveshaft spacer, some traction bars for axle wrap, a frontier tranny mount (or aftermarket). I hope this helps you get started.