Love the whole idea behind Remixes & Rarities. Not in every case when it came to choice of artists and what was actually included. I remember the Bonnie Tyler one that was somewhat lacking in remixes and rarities, but it was okay. One of the first releases was from Paul Young and even that one didn't include everything that fans desired which was not available yet on CD. For me it was enough, but maybe not for die-hard fans. There was another remix of Come Back And Stay for sure, without the scratch sounds.
I can think of 2 that were very good: Thompson Twins and AFOS. Especially AFOS because I had all the Cherry Pop reissues from them and found the Remixes & Rarities double disc exactly do the trick for me. With the exclusion of (It's Not Me) Talking and Factory Music (it's B-side) which was recently discussed here, everything that wasn't included before, found it's place on the Remixes & Rarities edition. Was also satisfied and happy with the sound quality. Everything from masters.
I understand that ABC will get this kind of treatment too, in the near future. Blank & Jones talked about this in one of their interviews on Paul Sinclair's site. They already have a kind of tracklist ready, which still fluctuates around some tracks.
Would love to see one for The Cure (although, with the coming up of the Deluxe Edition of Mixed Up this is no longer a wish list for me). If it's happening, don't forget the 12 inch versions of Primary, Love Cats and Inbetween Days.

Another suggestion would be New Order, but that will probably happen when hell freezes over.

What I would like to see happen (and this is very personal and very high on my wish list) is a release for the Time Bandits.