Classy's does great work, and they have very fair pricing.
While you're waiting on them to come in though, if you can find someone (young family member, perhaps?) that needs a few extra bucks, you could have him/her sand down the stock headlight housings and remove all of the old oxidation and haze... Then a little bit of plastic polishing compound and they'll look brand new, a wipe-down with some diluted spar urethane and you've got better than stock housings.
Of course if you order from Classy's, they'll use brand new OEM housings, and they'll include all of the hardware and harnesses, including instructions for the install. With having a 2004, you have different headlights than the previous 97-03 generation of GPs, there's two separate bulbs and circuits for high and low beams. If you get just low beams retrofitted with HIDs and projectors, the high beams will seem more like low beams. And if you get just high beam HIDs, low beams will seem even more low beam. Quad retrofits are kinda pricey, just because they have twice as many parts, but you'll have no problems whatsoever seeing at night.
Just a heads up, so you can make an informed decision.

good luck and welcome, if nobody's said it already.