I would sell the side steps and the cap, and buy something like a body lift if your looking for some height. I like the rims, they look great on the truck. Start with maintenance stuff, im sure a tune up with plugs, wires, and fluid flushes wont hurt it, and will make it that much nicer to drive.
you could do 06+ mirror swaps, a grill swap, theres a few options. But dont go for things that are performance "improving". most are a waste, my truck is near stock engine wise and runs great with good MPG.
And save your cash, I am a prime example of how mods get out of hand and cost you a crap load of cash! lol
06 Ranger XLT
5.5 Mid travel w/ 2.0 Fox Resi, Deaver F31 w/ 2.0's
8.8, 4.56's w/ Lock Right and 33's
McNeil Fenders and Bedsides