definately get the new grill in black powder coat finish it will go very well with the car ... don't do black leather ... the red seats look good but maybe black suade centers keeping red bolsters ... same for headliner and pillars ... do black suade or alacantra ... that's what's in and rightfully so since it looks dam good.

big no on the suicide doors as it just does not go ... i would leave the doors alone just cause everyone has scissors or lambos. its more unique, functional, and intelligent in the stock configuration.

do things that look and function better than stock ... do not mod just to make it different as it is not always better.

i really like the wheels you chose ... that was a good choice. save the money from the stereo upgrade since its not needed ... the door hack since its really not needed ... and put it towards your kleeman fund. call them up, nice people, they will tell you exactly the power your engine can hold. you will not be disappointed ... after talking to their engineers i am happy with mercedes engineering philosophy. srt swap will cost you just as much as the kleeman kit if not more. there is no such thing as simple with this car ...