In order of importance (IMO)
1. Leaf springs/bumpstops/frame support
2. 37's
3. Tie Rods
4. UCA
5. 3.0's
I think that costs around $10,000...give or take a few thousand.
Curious, you list 37's above 3.0's. You really feel they made a bigger difference than 3.0s?
I thought my 3.0's made a pretty big difference, more than what I expected. I'm about a month or so out from putting 37 inch yokohama's on my truck, so if they make that big of a difference... That would be very nice.
My list would go; if starting as a new owner steadily progressing,
Drive it!
Perch mod with spc alignment cams and a good alignment ~$300
Drive it!
Bump kit/frame support. ~$100-$2500
Leaf springs. ~$1200
Drive it!
Power steering resivoir with additional cooler ~$400
Drive it!
Brake pad upgrade with stainless lines and better fluid. ~$600
Drive it!
Tie between tie rods and upper control arms. ~$2000
3.0s ~5000
Knuckle gusset ~$300
Drive it!
37's ~$$$$
Fiberglass
Drive it!
LCA ~$1800
Cage $$$$
At this point I'd look at two different avenues. RPG dual shocks or, start over with a LT kit. Personally I'd probably go LT.
Front LT~$10000-$19000
Rear 4 link or LT leaf sprung back half ~$5000-$20000
4.88:1 ~$1500
Trussed rear or new frabicated housing with mech locker ~$$$$
Drive it!
I think once the Howe power steering pump (and possible steering rack) coming out get main stream, it would fit somewhere between brake pads and tie rods.