Don't get me wrong, the STS kit looks amazing, and Ive heard great things! Also, it's an easy upgrade to a twin turbo system in the future if you want more power! MUHAHA! Just make sure your oil return lines/pump/system are upgraded, cause Ive heard that's they're weakest point in the STS kit, and has the highest fail rate.
Supercharger just seems the safest, easiest, and most feasable power adder for the mid level-HP junky! = P
But seems like you have all the supporting mods for either system, so either way your gonna blow the tires off your truck! Good luck man! MOPAR POWER!
I was planning on doing this with my last truck, so I was on the fence, in pretty much the same dilemma you were.
Here's a couple threads I started for info.
http://www.ramforum.com/f50/fuel-system-upgrade-ideas-questions-2743/
http://www.ramforum.com/f50/engine-compression-parts-questions-2840/
And here were my plans...
Base setup for supercharger rated up to 8 #'s of boost: 80-110 HP
Fuel Mods
1. 255 Walboro Fuel pump... one, maybe two of them in a dual setup, not sure yet.
2. New stainless fuel lines
3. Fore Precision Works Billet Fuel Rails
4. Siemens 80# Fuel injectors (8)
5. Aeromotive 13129 Fuel Pressure Regulator
Supercharger Mods
6. Srt-4 Map Sensor
7. Boost Guage
8. Fuel Pressure Guage
9. AFR Guage
10. Procharger
Once those are done, it's ready for the supercharger!
More Boost Mods 12-18#'s 150-210 HP+
11. 6.1L Crankshaft
12. Forged Dished pistons
13. Ported Heads
14. Forged Lightweight Connecting Rods
15. 6.1L Springs/Retainers
16. Inertia Built Custom Supercharger Cam
and my old truck... I miss the **** out of her!