The Roland E80 rrp is £2499 in the UK and the shops are advertising them at £1999 cash, although I doubt some of them will be able to supply you with one on release date.
The SD5 I've seen advertised for £1750, so the Ketron is the cheapest and the E80 is roughly the same price as you can negotiate a T2 for. I do know that many friends who went to the Blackpool festival didn't think much to the E80 as it still sounds like a G70 with less keys but I'll wait until I get to play one. If this is the case (read the review by Abacus on SZ) then it could well look like Roland have shot themselves in the foot again.