I bought my 08 e63 for around 86K brand new in 2007. It was MSRP around 96K. The economy wasn't completely in the tank when I bought it, so I gotta think you can do even better now. Also, be sure to negotiate your trade-in car, if applicable.
If you are going to insist on the SLK, first, you shouldn't name price first. The first person to name a price in a negotiation loses IMHO. Say, "I want the car, but I won't pay sticker...what can you do." They'll probably come back with a 1-2K off, but hey, it is a start and it only took 2 minutes to do that.
Benz dealers will negotiate and drop prices for you.
Porsche - no chance. I was thinking about a 911 Turbo and the dealer wouldn't even drop $1K LMAO. Salesguy just said, "dude...people come in here and pay cash for turbos all the time...I'm patient." I just whined and went to the benz dealer to get my ghetto e63
