156 suspension prices+decisions, decisions

right, ive been looking at getting some new dampers, and im wondering where is cheapest to get them from? i have seen the eibach prodamper kit and novitec cup damper kit at alfisti.net, both 499 euro. which of the two is best, and where is cheapest to buy from? im wanting a little stiffness, nothing too harsh though. had thought about the bilstein B8 dampers?

i already have a set of eibach -35mm springs, would the above kits be ok with them?

also, where is the cheapest i can get the eibach antiroll kit from? so far ive seen £285 excluding VAT at ebspares, is this the lowest its likely to get?