Bilsteins are probably the best shocks, ZR2s come with them. Cheapest options to lift your truck would be a 2in body lift, lift shackles and add-a-leafs for the rear springs, and a slight t-bar crank in the front (no more than 1in). That should allow you to clear 32in tires (possibly with some trimming). After that you will start getting into 2in, 5in, and 6in suspension lifts which cost over $1,000.
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2000 Chevy Blazer ZR2
Performance Mods: Numerous
Suspension Mods: Some, but not enough
Exterior Mods: Just Right
1987 Buick Turbo T Dark Red
Low 11 sec sleeper
.030 4.1 block, PT6262E, & other odds and ends....
My Cardomain