the biggest gains for the least money? Is that what u want?
#1 gears!!! our trucks top out @ 95 with a 5speed in 5th gear @95mph and 4:11 gears were not even close to red-line. So if you want to hit 95 faster put in some 5:13 gears

#2 electric fan!!! no more drag from the heavy steel clutch fan!
#3 k&n filter will improve intake flow roughly 15%
#4 kill the ac! you could gain 15-20 hp just by installing a belt without AC
#5 exhaust many gains for top end can be made here our stock muffler is quite restrictive I recommend at least a straight through design muffler and while your at it try to get the muffler shop to run some 2.5" pipes with less bends or bends of a lesser angle.
#6 and least recommended is running moonshine or NoS
On a more serious end note one of the main problems we have in just about any pickup off the line is wheel hop. Get some traction bars!! Combined with big sticky tires you can get allot of extra spank off the line. If you do that you'll be wanting a better clutch soon.
Anything else like a turbo or super charger is gonna run u some bank and strain the heck out of your stock internals. I am all for an internal build if you have the space tools and know how. But swapping out your rear gears will get u 30% more torque with no engine mods.