I wouldnt' get a revo remap if you plan to carry out other mods such as exhaust and air filter. The revo maps are off the shelf so dont' take into account aftermarket parts you've put on.
A Jabbasport, stealth, etc remap is bespoke to your car so could squeeze a few more bhp over REVO's map.
Some of the 'fairly' cheap, but effective mods are enlarging the turbo's intake pipe to flow 70% more air. looking about £170 for that. Lightened pulley wheels were about £180 and make it rev more freely. Forge (or like) uprated dump valve (£80-100), larger front mounted intercooler (£various), decent air filter (£40-200), decent exhaust (£300+).
With all that lot bolted on and a bespoke map you could be pushing the 240bhp mark without compremising any reliability issues. Obviously when you get more power out of any engine is reduces it's life, but VW engines are known to go past the 300k mile mark so it's nothing to worry about.