Right if you want to transfer coiovers or resell them after stainless is the way to go I have KW's and simply are the best bang for buck, had the same debate and post about this. After using spax and koni which are very good nothing beats the ride on KW V1's. Weitec are the same company, but not stainless £200 price difference I think, but hey you can sell the stainless ones and not lose too much cash. V2'&V3's have adjustable shock bodies, but for the money forget it.
If you are on tight budget springs and aftermarket dampers will suit, but nothing and I mean nothing is comparable to coilovers.
Hope that helps!
V1's are the nuts drifting is predicatable and well managed through Apex's like rails, can't suggest and recomend a better product in my book of fussy equipment.
Jay