Tazio that's a terrible thing to say about me From what you are describing road use wise and car weight I would get a set of 200lb front springs. Progressive rear. we can get that sorted - well the guys at the shop can as I am lucky enough to be in Daytona working for 2 weeks. Check out the FB feed for all the info. we can even probably make it work with springs that could be fitted to a new set of dampers in the future thereby saving some future cost/redundancy. we have our own progressive rear Eibach sorins made for us. However the cheapest way would be to find some used Caterham springs and swap. The front will be as Richard said @150lb which is a little soft for my liking. Or just mix. Get some. 200lb fronts new and regular Caterham progressive rears. Hope that helps.