I've got the 9005 Silverstar conversion (like almost everyone on this board), but I don't think it is comparable to HID's. It is probably the best you can get for a simple bulb replacement. I definately think it was worth the $50 to replace the 9006 stock bulbs.

I've also got the 1157 and 194 PIAA Xtreme White bulbs in my clear corner lenses. They don't illuminate the road any better than stock bulbs (I didn't expect them to) but they look unique and they go well with the Silverstars IMO.

What are decent HID kits going for these days? When/if they come down to the $250-$300 range I might invest in a kit.