Looking at replacing the S2000 clutch before I put it in, was wondering whether anyone knew anywhere that is particularly cheap for doing so?

I have a halfords trade card but haven't rung them yet. So far I have found this on ebay, slightly uprated but barely any more expensive than standard kit on ebay

XTR RACING STAGE 1 CLUTCH KIT HONDA S2000 AP1 AP2 F20 on eBay (end time 20-Jun-11 13:08:07 BST)

personally i would just fit a standard clutch, the car will be a lot lighter than the Honda so having a more aggressive clutch will only make it feel more jerky when pulling away at low speed

As above, unless you're noticing clutch slip issues or abusing a normal organic clutch, stick with the original or similar rated.