Hiya, and congrats on your new X2. Something, something tire size over 28" needs clutch mods something something tires don't run true to size something something … That whole subject is a favorite on here. I recently picked up an X2 myself, and here is what I am doing.
1. I went with 27" Mudlite II. I went with the 27's to gain a little clearance. I've ran Blackwater Evolutions and I like them, but man are they heavy!
2. Spare tire is easy. A front tire as a spare will fit all 4 corners.
3. There are currently no 2" lifts available for the X2 as of last week. That will probably change. The only lifts I have found are the 3 1/2 " from Highlifter. You might be able to find a Highlifter kit as being available, I have not found one in stock, ready to ship. As of last week Highlifter is "A few days out" for having them in production. According to my phone call to them, no changes, they just ran out due to demand.