Set mine a 2.8 and not looking back. You wont be dissapointed trust me. I installed 3/4"tgc coil spacers in the back and i have about 3/4" rake.. To the eye looks perfectly level .. No vibration whatsoever. I knocked it out in my garage in about 4 hours that's with doin the bilsteins, rear spacers, rotating tires, and goin back and forth to the fridge for a cold coors, granted I have automotive experience it shouldn't be too bad for anybody. If you have a air compressor, some air tools and a spring compressor( can rent at auto zone) it is doable.
Got it aligned the next day and drove it to work and the bilsteins handle 100 times better than stock struts.
So its ur call but I say 2.8 all the way!