I, too, don't want to run coilover on my street car simply because the spring rates tend to run very high. The stock springs on a 240sx are 2kg/mm (1kg/mm ~= 56 lb/in). The most lax coilovers that I can find are the Tein Flex, which are 5k/4k. Those, of course, cost $1300+ dollars. Yeah, HE's cost a little less, but 8k springs are a little over the top for the streeet.

I've heard that people don't like the Tein s-tech springs, but they're 3.7k/3.2k springs. Also, you can get RSR race springs that are 5k/4.5k, which is probably the highest I, personally, would go on a daily driven car. These would probably be the best compromise on a dual use car, especially with AGXs.

By the way, rear strut tops don't control the rear camber. It's the rear upper control arm (RUCA).