theres so many options even with just that seemingly simple list, and it all depends on how much you really want to spend...
as far as the titan swap goes, you can run the stock front diferental with longer axles($600), or run the titan m205($600) with stock titan axles($150). for lower control arms you can go with aftermarket stock LCA($130), genuine nissan titan LCA($170), or $$$ dirtking hand tig welded LCA($2000). then there are coilovers, you can run stock struts and springs with cheap spacers($100), go with radflo/SAW/FOX/ICON coilovers($1000), or custom SAW coilovers specifically for TS swapped vehicles($1300).
then for the rear, you can do an Add-A-Leaf with shackles($200), go with ome rear leafs with shackles($400), or custom alcan or deaver leafs($800). and you may have to get a custom driveshaft($600) with that much lift.
arb air lockers are $1000 a pop and you have get some on board air to run em, luckily arb usually gives you a pump for free when buying a locker.
regearing is around $500-$800 per axle
so yea...6k should do it and thats not even the high end, thats probably bare minimum.
