If you went SOA, you'd probably need new driveshafts, and you'd need to have the bump stops lowered to keep the tires out of the body.
If you went 4" SUA, you'd need to lower the bump stops to keep the tires out of the body.
Your other choice is a 1" body lift + trimming, or a 2" body lift. With or without a suspension lift, a 2" body lift should allow room for 33s.
I *had* the Skyjacker 4" lift.. the rear springs gave me less than 2" of lift.. fronts were 3.5" or so. I now have just the front springs, with a rear SOA conversion. I'm moving up to a full-on front/rear SOA when I get the time/money/nothing-else-needs-fixed.
If I were to buy a new SUA lift, I'd go with the Triangles from www.SuperScoutSpecialists.com
"Tigger" - 4" Skyjacker front/SOA rear, 345/wideT19/4.09s/Locker&LS/33s/trimming
"Little Devil" - SOA, full-width 44s, 4.89, 31" tires, 304C/727