Which car to buy for my next project - E55 owners?

Well the good news is that w/ the E55 you are good for power, As long as it has that nice intact v8 but the body work can run you lots of $$$. The body work for benzs can be extremely tricky, as if you add too much it will cause a lot of drag due to the aerodynamics of the w211('02-'09). Look up some ideas on google b/c it is important that you know exactly what you want before you get into it