Need advice on 5.7 Hemi power mods

I have an 07 1500 megacab with the 5.7L hemi and i have done a few things for some hp gains, but i am unsure of where to go from here.

already have:

volant cold air intake
doug thorley mid tube headers
flowmaster catback exhaust
(cortex superchip) had to return to stock because apparently only shortie headers will not mess with programming, mid and long will cause problems according to cortex tech reps.

not looking to spend a ridiculous amount on more mods, but if anyone can offer some ideas and pricing plus amount of gains i would really appreciate it  
"If I was worried about gas mileage, I would have bought a KIA"