I got mine from my local dealer but you can buy direct (part no. BL-43B60) from here .... Bluhm Enterprises: They make a cool looking blue ring on the inside but throw a bright white beam. Stock bulbs are 45w/45w these are 60w/55w.
I just installed a pair of Philips Crystal Vision Ultras (#9003 H4 - 55W) in my Gen V and I recommend them. Be aware, though that a little "creativity" is necessary in getting them to fit the stock mount. The tabs at the 4 and 7 o'clock positions on the bulb flange dont align precisely and some "shaping and coaxing" (bent them back w/ needle nose) was necessary. These things are BRIGHT and worth the 40 smacks I paid for the pair. They have the "blue halo" effect too, but the light it throws off from the riding positon is bright white and almost reminds me of the Xenons I had on my 2001 BMW 330Ci. I think they're a good value.