Photoshop is a phenominal program, but it's $650 so I guess you'll have to determine how much use you'll get out of it. You may want to try Photoshop Elements for only $99.
BTW, Mikeinthehouse, is that the original paint on your 4Runner? It looks like you just brought the truck home from the dealer! Killer looking truck and beautiful paint!! I hope I can keep mine looking that good when it's 8 years old!