You could build a decent system for $1k.
I have yet to hear an oem audio system that sounds adequate. IF you are not a big sound guy, go with the HK system, I'm sure it is decent. But you said you were picky with regards to sound, so I would probably take that grand an build a nice system.
Alpine Head Unit
Infinity Reference Seperates up front
Infinity Reference Coaxials in the rear
Alpine V12 Mono Sub Amp
Kicker CompVR 12" Sub
Sealed enclosure
This would run about $1K and would sound significantly better than the HK system.
As prez stated, you would likely need to do the install yourself, if you wish to remain within budget.
BTW, you can get an adaptor to retain use of your steering wheel audio controls...
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