My thought process when buying my non-sport base was why spend an extra 9k for a 2012 sport when I'm going to change all that stuff anyways when I mod it or I can get a base non sport 2011 for 26k out the door brand new.
I have auto crossed it this past summer and last year a few times and stock for stock against another sport 6mt his time was 2 secs faster because he was running a square set up on Hoosier a6 tires. My brakes are great since I put super blue race fluid in. So it's all up to you and how much you want to spend. The only thing I would like from the sport pkg. is the syncro rev match. I heel toe just fine but not perfect like srm does.