If I was gonna turn my shee back into a duner and looking to do it at a "realistic cost"
4mil stock jugs with a dune port and CPI, T-5's or PT Hi-rev. I wouldn't go any bigger then 35 pwk's. The builder will suggest compression and timing settings. Get some +2 +1 a-arms with some nice shocks (Front and rear). Wider axle, G-force axles are nice and will help keep the cost down. I liked a +2 swinger for duning, wouldn't go any longer then a +4. Anything longer and it gets kinda hairy when/if you do any jumping.
I like skat~trak tires. Probably a 9 or 10 paddle edge tires should do the trick for the rear. Up front I'd run some mohawks and put them on 10x6 rims. The wider rim will give the tire a wider body for better float. Then finish it off with the usually items..