Rowlers, I'm glad you got there in the end! Should have listened to uncle Rob months ago!

Eibach springs are the sh1t !
I'd go so far to say that if your car is a daily driver I would recommend them over coilovers, cheaper, handle nearly as well and much more comfort (assuming your shocks are in good condition).
The reason to go for coilovers would be to get the car much lower (cosmetic reasons only).
I have a daily 8v on Eibach springs and a G60 on Weitek Coils.
The 8v could probably out handle the G60 on crappy rough B roads tbh, as it is better able to cope with poor surfaces (more grip) especially in the damp.
On track it's a different matter though.