We're not the only ones to provide remaps mate, there are other quality companies too.
But in my honest opinion (forget that I'm a tuner for a second) I would say you need to avoid the tuning boxes.
They simply inflate your fuel pressures, force the engine to work harder and hotter and are only altering one of upto 30 variables on your car..
I'm sure others will offer you their opinion, that's just mine.