rear ARB, WALK, TT lower control arms, uprated pads, THS engine mounts and then you'll have a superior handling car in everyway but with zero change in the day to day driving comfort.
Whiteline Rear ARB £150
TT lower control arms £350
Pads £100
engine mounts £240
leaving you around £150 for fitting
Coilovers are the best part of £750+ for the cheapo bottom end KWs. then add you arb and you already creeping over the 1k region with fitting costs and less to show for it