Indeed, proper schocks and springs, ARBars and good bushes cam make a real difference. Certainly when accompanied by some really good tires.
I have a Bilstein PSS coil over kit, coupled with Eibach ARBs and Powerflex bushes. Tires are Pirelli P7000 or Bridgestone Potenza s-03.
I am now testing a 205/40/17 at the rear and 215/40/17 up front. First impressions are good, but I need to take it to the track to really test.
As far as the ARBs and Bilsteins I wouldn't want anything else. If you don't want to spend your pounds on coil overs get some Bilstein "Sprint" dampers and Eibach or H&R springs.
But be shure not to forget your tires!!