Here you go, 2" block's giving you 1" of lift.
http://www.readylift.com/products/chevy/chevy-silverado-1500/rear-block-kits/chevy-silverado-1500-1999-2013-2wd-4wd-6-lug-2-block-kit/silverado-sierra-1999-2013-2wd-4wd-6-lug-2-block-kit-chevy-gmc-2-oem-style-rear-block-kit.html
Check out the Kicker Hideaway system. I had it in my previous car and it added that little bit of bass a stock system lacks. http://www.crutchfield.com/S-vTmi3TwCLdr/p_20611HS8/Kicker-11HS8.html
My father has that size BFG's on his gmt900 that is leveled. He runs 50lbs in the front and 40lbs in the rear. (We did the calk test) It rides firmer than stock, but it isn't bad by anymeans. He is getting around 15-16 around town, which is a decrease from the 17-18 he was getting. I believe you'll be happy with this setup.
Edit: I just read your last post. Im glad you're happy with them, I'm going to try to get a set this summer.