If you can unclip the rear brake pipe it wil spring far enough to remove the hub/disk and leave the calliper connected, hanging from a string.
I use EBC greenstuff (£100 from Paddocks I think) all round and standard disks, though I prefer the Delphi ones to the honk-kong-fuey, the unbranded ones go 'patchy' once you've broken the surface and give you a judder I find.
The brakes were great 'till I went onto 235/85 tyres, now I'm struggling too.