there's couple ways to go:
first you can just replace the stock bulbs (893's) with something a little nicer, I installed some Eurolite Xenon 893's, and they're ok, but I basically payed 30 bucks to change my bulbs from yellow to white...
I'm probably going to upgrade to eiher 885's which I think are a 50w, or 55?, bulb that drop right in to our sockets, whereas the 893's are 37.5w.
I've heard good things about this except that you can probaly expect to bubble the lenses after a while...
The best route with respect to quality is the PIAA 510's, they make a complete assembly replacement (housing and bulbs) that drops right in...from what I've heard they're bright as hell, but over 200 bucks!! so its your call..
!$#@!@ I need money
