From the last time I priced it out, $5k +
Total Chaos Kit that kit doesn't even include the coil-overs or the shock hoops, of the fiber glass fender replacements. Then you need to upgrade your steering, and you should probably get limit straps.
Oh, yeah the suspension conversion from Total Chaos is designed for longer travel which also gets you a wider track up front (which causes your wheels to stick out further, hence the new fenders).
Then there's the SAS (which'll run you about $10k unless you do it all (and I mean all) yourself.
Calmini SAS kit That doesn't include the coil-overs, sway bar (if you drive your X daily you'll want that), driveshaft, steering (if the steering from the donor axle is toast), or rebuilding the axle (gears to match your rear, or new gears front AND rear which gets more expensive).
So like your like comment like that like asks us like to like tell you like how to like convert your Xterra to like coil suspension like wasn't very decriptive...like we need like a ton more like information to like even begin to like steer you like down the right like road like.