SLI rig I would take the Eclipse aswell over just about anything.
The v1000+ is certainly capeable of running a SLI rig just fine but the Eclipse seems to be much better suited to SLI than any other case.
PC7+ can handle SLI but its a bit of a squeeze, the v1000+ can handle SLI just fine but will be a bit noisey, but it can handle it easily.
The eclipse, is cheaper (or add a blowhole side panel) cools well, is built well, and it can be quiet with a SLI rig!
The one major flaw with the eclipse is the use of plastic on the front, its good quality plastic as far as it goes, but plastic none the less.
Coolermasters after sale service has gone to pot, the quality control has got to terrible levels now, its a right old bad state of affairs and I would struggle now to recommend any case made by Coolermaster, as they provide no support and the build quality is getting to the state of the old thermaltakes now.
Overpriced for what they are, last 2 centurions I have seen are not a patch on the ones 4 months ago even, it really is a bad state of affairs
The Eclipse is just about your best bet, its built well and is the best case from a cooling / noise point of view for SLI.
In answer to your question, the v1000+ would be better, I have ran a SLI rig in a v1000 and a friend of mine has a 7800gt SLI rig in a v1000+ just fine.