SNR rear discs from GSFcar parts, they're like £150 for a pair with their 60% off (normally at the top of their site) SNR make them for Renault, I've run them for a good while and so has many others.
I'm not a fan of DS2500 pads, I'd rather go PBS ProRace all round (or even just fronts) I got told to try them by a few on here and they're brilliant, near standard initial bite as OEM pads but then they took a beating on a roadtrip not long ago and just kept taking them, I'm talking a lot of heat into them and they were great!