You have alot of options for tuning. DP Tuner
Diesel or Tony Wildman if I could ever manage to remember the name of that place. Talk to them, they'll hook you up with what your lookin for.
All are leaps and bounds above the generic tuners/chips. Nothing really WRONG with Banks, just that its mostly WAY overpriced, and WAY underachieving compared to what you could get for the same/less money.
You'll need more than tuning to hit 500 in a 7.3, injectors, probs a turbo, HPOP, some other crud that costs a bunch.
You could always just Powdercoat your stock valve covers, IC tubes, etc. I've never seen aftermarket covers, but I've never really looked to be honest.