When I bought my R230 SL500 I also looked at an SL55 that would have cost me double what I paid for the 500, I was tempted but I couldn't reconcile the AMG's extra cost given my intended style of driving the car. I now also have an Audi S5 (3.0 V6 supercharged) that gives me the same adrenalin kick as an AMG for less overall cost so getting a 6.2l car for similar performance but a lot more cost doesn't appeal at the moment I have driven a C63 (4.0 biturbo) at an AMG experience day didn't impress me at all.