Get a DiabloSport I2 from Moe's Performance with the custom tune by HemiFever. Give Matt a call. They have everything you need to make this happen.
I've used the DiabloSport on three HEMI powered vehicles, I've helped other owners load their tuners on their cars and trucks, and they work quite well. Add a custom tune and they really really wake up the HEMI.
They have some good options too, such as correcting the speedo for bigger tire/wheel combos, fan settings, WOT shift points, throttle booster, and a whole lot more.
Good luck with your decision.