A 30k service will set you back at least 2500.00 and probably more like 4k on the Ferrari and the Lamborghini. The new Mercedes sl is a fine automobile and probably be my choice because I have had both the new sl's and the C-5 corvettes at triple digits and let me tell you the MB is a hands down winner. The C-5 was VERY scary at 125. However, I have never driven a ZO-6, it was a 2000 C-5 LS-1. I have never driven either the Ferrari or Lamborghini so I can't help you there but the maintainance costs alone makes me think those cars are for someone who doesn't need to save to buy one. I think for what you want to spend you should look at the vette or the MB, I also think once you drive both of them you will know beyond a shadow of a doubt which car you want.