Hey bro! I see you're in the market for a 5GT. You're in luck, because I'm selling mine
I have a 2010 550i GT with only 24,000 miles on it. This GT is like no other, it is really one of a kind. Over $8K has been invested into this car, including DINAN Stage 2, custom exhaust by ACM, H&R springs, etc.
This beast has been to numerous shows, been featured on various social media, and in fact has won a few awards, including Best in Show at BMW NA Headquarters.
I know this is a step up from what you are looking for, and I see you currently own a 335, this car looks/goes like an absolute monster, and you will not regret getting a car like this.
Read all the details about it here:
http://f10.5post.com/forums/showthread.php?t=873751