Hmm, just looked at your profile. 04 Lightning. SVC without a doubt. They either own or have tuned the 3 fastest lightnings in the valley.
There are other shops that are good in the valley (AZ Dyno Chip, Duffee's) but SVC really knows their lightning stuff. You'll be fine most places around the valley, just stay the f*ck away from AMP.
i was referred to az dyno chip by someone from here(dont remember who)
took it up there about two weeks ago and had their guy come out to tune my truck even though its a chevy he fixed my fuel perameters it runs great now i also got it dynoed.