You can buy brand new CK's for about £500 which are very similar , so imho you need to consider that . £700 would be a max with decent tyres on them with plenty of life left in them ....
But then things are only worth what someone will pay for them ..... I had a Sony Box TV i paid £1100 for and i gave it away
If you own a ED30 keep them , they are ED30 specific wheels and part of which makes the ED30 special