My rear discs have seen better days, so looking around for replacements I found these:
I realise Green Stuff isn't well regarded on the Elise, but at that price, it's mighty tempting. Seems cheaper than most places for the same discs on their own. . I'm after a road set up really, so thinking these might do the job.
My car currently has plain discs upfront with CL's, with what I believe are OEM drilled rotors / pads at the back
One thing I'm tempted to do is swap things round a little. Plains at back, USRs up front.