That would probably make for a good combo as well. This may just be hearsay, but I may have read somewhere on here that the Dinan springs were the BMW perf. springs. Have you heard anything similar? Seems strange that Dinan would go through the trouble to have them painted a different color, though (looks like they're a blue-ish color on Dinan's website) which is what makes me think they may be different.
I've priced the BMW perf. springs and Koni's and it looks like I'm real close to Dinan's stage 2 suspension, which of course would come with Dinan's warrenty; so the water isn't getting any clearer to say the least!