As Steve already stated GMPP does sell a variety of drive systems. I thought I would reiterate this since I found it to be one of the most cost effective purchases I made in gathering the parts necessary to run the ls7. Less than 500 bucks gets you the whole package including hardware. Granted this one is non AC, but its ridiculiously inexpensive.
Wegner makes a nice accessory system but Im sure your gonna get close to the 2k range. The damper typically requires an aftermarket version when going with the performance set ups.
Rich