I guess that depends on your budget.

Pesonally (and I'm sure somebody thinks differently), I'd go with PIAA or Raybrig (Stanley Electric Co). I have the PIAA Xtreme White Plus H1's (55W=110W 4000K bulb), which are DOT approved, don't look "purple", and cost about $70 for 2 of them.

Oh, and I had the PIAA H1 Spark Blue's, which the company clearly states is "intended for off road and show purpose, NOT for street use." I replaced them because the state troopers wrote me a ticket for having "blue lights" on my car.