Had a 2011 gti wih the autobahn package, traded for a 335i but also drove the 135.
Either one, you'll love it - much faster, and rwd handles better. I was tired of fwd tire spin and poor build quality. (I had rattles, water leaking in, wind noise, high oil usage) all on a brand new gti! I wasn't alone either, check the mk6 forums.