To sum up for you mate...
1. Full engine service
2. replace suspension ( with uprated components if possible )
3. Breathing mods:
> Induction kit ( prefarebly enclosed )
> Ported and polished throttle bodie
> good catback exhaust system
> 4-1 or 4-2-1 performance manifold
Thats a good start then once you have done all that, cams and a remap. Then if you want to go even further Throttle Bodies, Turbo or supercharger
Lastly get in touch with the user on here ( spencercammedvts ) he will port nd polish your TB for £26.
great service from my experience.