I had several products from Edge and Banks, and none of them come close to the performance of a DP-Tuner
chip. Jody's programs are excellent. The mods are only limited by the money you want to spend.
I would recommend some type of a shift kit. I built an accumulator VB
for mine with parts from Sonnax, but several outfits like BTS can set you up too. A new torque converter is nice. The stock internals will take a bit of abuse with a good TC and VB
After the transmission mods go for a set of Injectors, Stage I or II. If you go bigger than Stage II's you probably want to do a set of rods. I'm running Stage II's in a PMR truck with no problem, good tuning is important.
Another easy mod is to crank up the fuel pressure. Either shim the factory spring or buy a replacement spring. Around 75 PSI seems to work well.
Even though it is expensive, I'd look at getting Big Oil. If I only had one mod to do I think I would probably get Big Oil. Even with stock injectors it makes a big differance.