Wouldn't touch Spax, Ohlins, Koni or Bilstein tbh. Have taken the apart and tbh are not really that well made.
Penske do some good dampers - that are made by another company that I'm not allowed to mention.
Personally - Go with ones that you have to rebuild every 1000km - buy a stack load of spares *dirt cheap anyway* and then you can customise them to whatever you want just by changing the shims/piston/pressures
Piece of urine.
Little expensive though - £4k a set for cheap ones - up to £10k for 4 way adjustable with pressure BOV's, remote reservoir, with a F1 style 29mm diameter piston, titanium shaft and accessories, magnesium caps and covers, aluminium bodies and 10ton instantanious pressure capability.