Ah! Somebody who's interested in proper performance gains!
It was about 15 months since I was at proflex, full kit of 3 way coilovers for the front and 3 way roller bearing struts for the rear, all for a hawk was around 5k. Would think four top spec coilovers would be around 3.5k to 4k. Spending time on optimizing geometry and reducing stiction and fitting a well designed brake package would be a very worthwhile method. It's night and day between cheap, 5hitty dampers and quality ones. If your pockets are deep enough, look at reiger or exetc! For a cheaper option, some ohlins campers from motorbikes may suit but you'd have some homework to do first on lengths, valving etc.