Best mods on a 16V
ibiza for £2K would be 25mm front, 28mm rear ARBs, 15mm rear wheel spacers, some bilstein yellow full ride height dampers with matching springs, new front top mount rubbers, audi TT bushes in the rear pivot of the front wishbones, 4 new R888 tyres on some 15x7 ET35 lighweight rims (team dynamics pro race 1's or some OZ superleggeras). New gearbox oil. Full engine sevice.
Any money left, some Ferodo DS2500 front pads and some pagid fast road rear pads. And a brake fluid change for Halfords top-spec fluid. And some stainless brake hoses for the front only.