So i'm trying to figure out some new tires on my 2011 X5d

Getting some 22" 215 replicas, 9.5" all around, a couple of questions:

1) I know a 265/35/22 would work, but how about a 275/35 (do they make this size) or 285/35?

2) Does it make sense to run staggered tires sizes even though the wheels are the same size? say 265 front and 295 rear? using some 15-20mm spacers in the rear? or should i stay with the same size tires all around and then use spacers in the rear to fill out the wheel wells?