Dont bother with kents, fot £90 they will be regrinds unless they are feeling extroadinarily generous. Reginds are horrible for our cars, tap to buggery and generate some rather nasty harmonics and snap acceleration rates (of the valve, not car), and it certainly wont be 16bhp gain.
LIke i said, the manifold is the single best mod you can make to a standard type car. If you cant afford a remap, have just the lower part of the manifold modified, then have the upper aprt done when you can afford a remap.