I just had the stage 1 map done. Have now booked into konzept to get revo intake, downpipe, sports cat and rev G valve.
I have fitted other parts for maintenance reasons, new timing belt, water pump, PCV etc.
I would advise get the boost issues looked at fist before you go for a map. Once this is sorted the I would advise getting the stage 1 first and see how you like it and how the car responds. If all is well and you like it do the intake, downpipe. You could also go to stage 2 at that point.
I haven't done a dyno so my BHP figures etc will be estimates. I expect after my recent mods have happ I should be in the region of 260 to 270 BHP. Do you know anywhere that has a decent rolling road in the glasgow/edin area?