Top handling modifications?

[botboy]

Curious as to what the top modifications are considered for 67-72 and 73-87 GM trucks. I like the way trucks ride but also really like to rip around the corners. A few that came to my mind:

1) Disk brakes (if you don't have them - rear too if you already have front ones)
2) Stickier & wider tires
3) Better shocks (especially if you've got the factory ones)
4) Sway bar for rear, heavier sway bar in front
5) Different springs - stiffer ones than stock, lowering
6) New bushings - Prothane or energy