P-torque, end of. my mate had his car done there and it feels completley diffrent to myn.
there competative on prices and most people see higher figures than other companies, as well as a strong and smooth torque curve. its worth a drive for it as well if distance is what your worrying about, but they will also map your car if you post them your ecu.
will is a top bloke to. i think at the moe it bout £265 for members of SCN, but dont quote me on that.
and im sure there will be an army of P-torque devotes to post soon, btw have a look at his section for feedback given.