Great choice, I've had my 35i for 3 years now and I love it to death. Found something out about the car though recently - if you leave it parked with the handbrake on for 2 weeks be mindful the battery might discharge. No big deal but eh, first car where 2 weeks has been "that point" for me. Not sure if it's because the handbrake is all electric (well it electrically applies the normal brakes to act as a handbrake) or this is just standard affair for the car though.
The handbrake I'm not too sure about sorry as I have a manual but the other thread about electric handbrakes at the moment seems to suggest this won't be a problem. You can quickly check behaviour though, turn the car off with the car in park and handbrake off see if the red light on the handbrake comes on to show if it auto engaged. The light also comes on when you lock/unlock the car for me if you want another check.
Other things to check if you didn't give it a mega go over in the showroom - see if you have heated steering wheel (right hand side of the column, button switch), see if you have the storage addon / pass through to boot through the middle wall (should be a compartment between seats on rear wall with plastic back). If you have cargo net in the passenger footwell you have the extra storage addon but it's a bit pointless.