Sport package does not change wheels on the 135. The M-Sport package (at only 200$ more) will give you the M wheels, black headliner, and M badge on door sills.
You can get power seats with sport seats. It's up to you whether you want it or not. I have manual seats. I set my position when I picked my car up at the dealership and haven't touched it since.
2007 SLK55 AMG - Black on Gray/Black - AMG 030 Performance Package
2011 135i - Traded
///M-Sport - Dual Clutch - Harman Kardon - Bluetooth - iPod - Shadowline Kidney Grill - 225/255 Star Specs - Hotchkis Front Sway