I suspect that the Spax + Empire kit will produce a very good setup indeed. Sure the Suplex kit is probably better, but there again a £4k Ohlins kit should be better still?! You have to stop somewhere.
We must not forget that aside from the bumpsteer issue, we were all very happy indeed with the handling of our motor cars as they were delivered, so we can't be anything other than over the moon with the end results having fitted some upgraded parts. You can always make improvements, but will they always keep the real essence of what made the cars fun in the first place?
Biggest improvement right now would be dry sunshine - and that would cost nothing - but I can't see that available on the Aero-Racing website anytime soon either!