I went with the Helix brand. Costs about $500 for the pair. The low beams are swapped over from your old lights and the high beams are included halogens. I upgraded to an OPT7 HID kit (good prices on their website). Install is plug and play, really simple and quick.
If I had the means, i would've gone for an LED kit for a bit more light, but it's hard to find good LED kits for reasonable prices. Don't cheap out on them, either, because you don't want to be shooting light in all kinds of arbitrary directions.
Also, word of caution: some Helix users have had peeling on the outside of the housing. For this reason you may consider OEM or Ed's brands.
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