Hmmmm, now whats all this I've missed out on in the last few days.
I agree with John and having tried every suspension option available for the coupe I can comment on them all
S1MMA, you would have to go very stiff on the anti-roll bar (sway bar is an american term) to get the effects your talking about, the off the shelf bars for the coupe are only a slight upgrade so you shouldn't ever suffer with that.
My aim was to have a fully adjustable suspension set up that would work on the road and the track, Leda came up with the goods and after a vist to their factory in Essex the spring rates are now well sorted.
Im on 18's with 35 profile tyres and the ride is good, on the standard 16" wheels its very impressive. It handles bumps better than the standard suspension could and over A and B roads it can carry much more speed. No bouncing like there can be with the Billys and Eibachs, it just squats and gets on with it.
This is on a coupe with uprated anti-roll bars front and rear, uprated wishbones, full Leda coilover set up using 2.5" Eibach ERS race springs and ERS progressive tender springs.
Its not cheap with over £1600 worth of suspension goodies but its a well sorted chassis now.