Call Phil right here at Fastlane for many of those bits.
The 98-00 smoke taillights are a bolt in.
If you need a new exhaust, you could go with OE. You won't pick up any ponies with an aftermarket, but you might save a few bucks and get a better sound and look. AMG sells a really nice system.
Keep us posted on your progress. I know lots of members will be interested in the Xenon HID conversion!
1998 C230 "Black Betty"