The need for Nitro shocks is a personal decision. If you are in a more temperate environment, fluid shocks would be sufficient, whereas if you are in a climate that sees more cold temperatures or put your suspension through a large amount of cycling during use, the nitro shocks are well worth the extra few dollars. As far as your 8.8's, as long as you are not going any larger than 38's; with a little bit of work, the 8.8's will stand toe-to-toe with a 9". Buy putting a locker in the rear-end, replacing the stock axle-shafts with a decent set of chrome-moly cryo-hardened shafts, adding an after-market bearing kit to the outer end of the shafts, and gearing the axle correctly for the tire-size you wanna run, that axle will stand up to almost anything you wanna run your rig through.