I've gone for H&R's with my Cup suspension, but in a lot of ways I'm not as confident with the car as I was. It's lower, and can corner a bit quicker, but on bumpy roads it's all over the place, almost to a fault.
I'd go coilovers if you can. I drove a 197 on KW V1's and it's a MASSIVE difference...
Europerformanceparts are good, but any H&R dealer can do them
They are about £225 now. KTec can get them too, and you get 5% off presumably. They used to have them on their site, but removed them after the price increase from £170