Top 5 SRT-6 Upgrades:

1. Code3 Pulley ($650)
2. NeedsWings Cold Air Intake (get the dual that is soon to come out, the single costs $450)
3. NeedsWings Intake Manifolds w/Y-pipe ($1,750)
4. SprintBooster ($300)
5. Custom ECU Tune ($500 from either LET or InMotion)

Total: $3,650

Next 6 Upgrades:

1. NeedsWings SuperCooler ($450)
2. Code3 Belt Wrap Kit ($200)
3. Code3 6mm Phenolic Spacers ($120)
4. Engine Management/Monitoring Computer (DashDAQ & Zeitronix Wideband AFR, $880)
5. Iridium Plugs (colder) and new wires ($278)
6. New Tires (you'll need them after you play with all your new toys, $???)

Seriously, though, the first five things you should get are a cold air intake, pulley, manifolds, an ECU tune, and a sprint booster. Many will argue which CAI to get, or whose manis to get, or whose tune to get, and if you should even consider a sprintbooster. There's pluses and minuses to all of them. Do some research, check out people's signatures, ask questions, and GO FOR IT!

Also, wait for group buys if you can. You can get SIGNIFICANT discounts, which means more money for more parts! If you have all the cash up front, buy it all at once and ask the vendor for a discount. Most will be happy to make a big sale and accomodate you.