PIAA 80XT's my friend.
IPF 960's are good too, and were on sale at Overlander. I have both, I like the PIAA's better.
I've seen the KC Daylighters in action--they're bright, but way too narrow for my taste.
The Hella 500's work well for the money, and you can put 100 watt bulbs in them, but they don't hold a candle to my 80XT's (I wheel a lot with a friend of mine who has 4 Hella 500's on his front bumper.)
Don't know about Pro-Comps or Warn.
If you check my website, you can find comparison pics of the PIAA80XT's against the IPF 960's, as well as the high and lowbeams. (Look under Mods, Lighting Comparison.)