ecs iam not a fan off, dont go there... (gayness)
tdc I have talked to them and they know what they are doing (400-600)
xx is good but very very conservative and 3x the price of anyone else (1.5k)
dent sport is very good aswell and I have talked with them... 2x the price of tdc (looking at 1k)
I would take a road trip somewhere away from here like topfuel.
XX is one of the best around and does sick work but will sell ya crap top dollar parts and waste your time (they are all about aps raisin!!!!!
I would say tdc or dent sport (tdc will make you the most power).