It doesn't sound like a lift is worth it for you...you are not really doing anything a lift would improve as much as other mods would.
For sand, you want big fat tires...so you need a BL, not an SL, as the SL won't let you stuff the big tires.
ONLY larger tires will raise your diffs, so only a BL will let you do that.
In dunes and whoop de doops, one tends to fully compress the suspension, on landing, etc....and you NEED the tires to fit into the wells to do that.
As its the front bumper hitting on approach, raising the body will improve your approach angle, mitigating that problem.
If you do a 2" BL, you can run 33's for example. A 3" would allow 35's with massive trimming...but make it hard to make the bumper's match w/o a gap, and take more of a committment time/effort-wise.
That's the cheapest way to improve your performance. (BL + Big Ass Tires)
BL's do not raise the center of gravity enogh to notice, as the body is light when compared to the MUCH heavier frame, drive train, etc.
If you get an SL, it raises your center of gravity, which on dunes, etc...makes off camber situations more hairy/increases the odds of a roll over. (3" is not an extreme lift, and the extra hairy-ness is relative to a stock height rig...)
Adding a PML would be a cheap extra margin of frame clearance, and probably worth it.
So - for what you describe, a 2" BL, Big Ass Tires, and a PML, is the cheap seat.
_________________________
- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif