Sounds like a nice combo. I have the 20" rims and trak pak. These are the chrome clad and they are not that bad. I have the 6 speaker Bose system with the MP3 player hookup and its really nice. The 6-speeds have a different exhaust system and I am not changing mine, sounds just great. Reminds me of the 440-4bbl of the 70s. The head lamps that are HID are for those who are into that option. My son has a 350Z with the HIDs and I don't like the line that looms infront of you with no light bleed. But the clarity is betteron the HIDs. As far as price I bought mine 2009 Inferno-Red sun roof, trak-pak 20" rims, 6-speed for $33550.00. Under MSRP by a few thousand. I think you can do better if you push the issue
Good luck and hope you choose the Challenger.