Ants, have you considered the German KW Suspension?
http://www.kw-suspensions.eu/int/kw_variant_3.php
Not sure on pricing, but plenty of top level motorsports teams use them, and have seen plenty used on the Hillclimb stuff too. Something that I'll be looking at when my current RG coilovers fail (which they're beginning to do) in my Silvia.