I've talked to my tuner about different ecu's, Haltechs are not as good as others for a number of reasons and are over rated. the better ecu's out there include Link G4, vipec, autronic.. After talking to him I'd still get an apexi pfc over a haltec
I'd suggest finding a tuner that does one of these, I'm using the link and am often complemented on how smooth the car is to drive, even with the extensive mods I have