I'm running KC's Titanium Slimlites and I wouldn't have it any other way. I have a few freinds with the cheap knock-offs and Autozone versions, but they just can't compare to my KCs. My KCs also blow my freinds PIAAs out of the water. I will never by anyother brand light ever again.
On a side note, KC's lights have a 23 year warranty against everything except breakage from running them into something. I had a burnt out bulb a month ago, called them up and had the new bulb in 3 business days and all I had to do was send the old one back to them. Execellent lights and execllent costumer service. Spend the extra money and do it right the first time.
Here's what I'm running:
http://www.quadratec.com/cgi-bin/sg...2&UREQC=3&UREQD=4&FNM=00&UID=2005121422271814
Here's KC's Warranty Policy:
http://www.kchilites.com/warranty.aspx