2700k tbh mate, MVP is in its early stages of development and it seems to have more negatives then positives, people have reported drops in framerates and green artifacting that makes games unplayable.
Personally i don't like adding another cog to the workings if its not going to give me consistent improvements, although MVP has proven itself in some gaming titles to add atleast 50% more frames without overclocking..
I was personally going to jump on the ivy bandwagon but i have decided to keep my z68 board and buy a 2nd hand 2500k and overclock the crap out of it.
But you are already sitting on the z77 board so it's really down to you and how you feel about ivy bridge
I'd say if you find a SB chip for a good price go for it, if you can only find SB chips for their usual prices i'd be tempted to opt for an IB chip, though there's no performance gains with IB apart from higher memory clocks
Btw if you're based in the UK, Aria are selling 2500K's for £144, 2600K's for £210 and 2700K's for £234 which are awesome prices, so i'd defo go for one of them if you're in the UK.
No MVP will not work with SB chips but that's ok as the programme still need refining. Some tests have shown bugs and decreases in performance with MVP, others show increase in performance, so it's a bit buggy at times.
I always have my virtue software off. Because of the nature of the program there will always be a minor issue here and there that will cause freezing or BSOD. It's just yet another driver that does stuff with another driver (mainly video driver) to accomplish something. Yea you might get a boost, but stability will always be better without.
best thing to do is wait,as you are looking at a full platform jump,I would wait untill prices surface(because unless these Ivy's are as easy as snot) they are not worth it(If you want pure gaming chips),Do not buy now if you are looking at a full system,wait untill we know more and prices drop/equalise....