What exactly are you looking for? Do you just want a flash to stick on the hot shoe? Are you looking for a full studio setup? Or something in between? When you say some sort of lighting, that is an incredibly broad subject.
If you just want a flash, the 430 EXII flash is a great flash that's reasonably priced. You can get a 580 EX for a bit more if you want something with a few more bells and whistles.