I was using the eurodezign 5200k bulbs, they lasted about 5 or 6 months and one blew, strange thing was one of my fogs got hit by a rock and put a little spider crack in the lens but it was the bulb in the other light that blew.
Replaced them with eurolite plasma h3's, they look good, not as white/blue as the eurodezigns but the same range the the light itself is a litle clearer.
I heard PIAA and silverstars are supposed to be good bulbs, but the eurolites were 14bux instead of 30 and eurolite is a pretty trusted name in lighting stuff for cars, i was lookin at their new HID kit that uses phillips ballasts