FWIW, as a newb myself, I'd go with the auto + premium package.
We just bought a 2009 328i xdrive w Sport, Exec, premium, sound and saddle brown leather and it's beautiful. You'll wish you had the primo interior - that's where you live in the thing. Also - my personal opinion is black on black is overdone.
+1 on the sport seats.
With the auto in 'sport' mode, it really changes the way the car shifts and feels wrt to acceleration.
Try them both (or check in Halifax for more selection)
Good luck !