Just looking at the specs for the DS2500 - they don't appear to be any better than the Mintex 1155 pads I already have.
I was looking at the Pagids - again the RS42 (blues) also don't appear to be better - have I got this right?
I understand that M1155 don't work well from cold so should not be used on the road. I don't know much about he pagid. Here is a link about the Mintex:
http://www.retro-uk....mintex_pads.htm
My friend uses Ferodo DS2500 on his S2000 and says they wear quickly but are good from cold with little fade on track, they still fade a bit though but maybe this is the best compromise whilst still suitable for the road.