$2,700 is a little steep, but I'm almost certain the cost will be reduced when you combine Lifestyle with the Premium Package. Even BMW can't charge you twice for leather seats (well, let's hope not)!
I thought about combining M-Sport with Lifestyle, but the more I look at the details, the less sense it makes to me. The Sport Seats can be ordered as an individual option and I'm likely to add the Performance Suspension which scraps the Sport/M-Sport suspension bits. From there, the only things that would appear to be missing sans M-Sport are the black window trim (which I'm not fond of anyhow), the steering wheel, shifter and headliner, none of which are deal killers for me.