HELP! Forced to upgrade: which way to go...i7-3930 or 4930? Cyber Monday tomorrow!

I just learned my Seaside gold power supply has died, taking my Asus motherboard with it (I've been running with a i7-950/48 GB) and I need to choose between these replacements. Had originally planned to wait for Haswell-E 6/8 core but the universe intervened... Is there any real difference between the two choices for running heavy vst/sample packages in X3? The 3930 is currently on sale for $449 at new egg till Monday and it looks liker the 4930 is stuck at $579 at the moment...I was frequently taxing my 950... Also, any thoughts on motherboards? I have both firewire PCI and PCIe cards, am going to add a couple SSDs, and have 3 speedy Samsung drives at present...plus a basic graphics card. Don't really need a bunch of stuff beyond support for external drives/usb 2/3 as this is a pure music machine... and while Seaside has gotten great reviews from silent computing, I may switch there too, although I figure the universe knew I was underpowered (too many power hungry tools like Diva and LuSH) and has given me this push Any thoughts would be much appreciated, as cyber monday will save me a few duckets on the new power supply, board and maybe cpu... 
 
Thanks!

slartabartfast
I am not clear why you are replacing a CPU if the motherboard is defective. Is the CPU soldered to the board? Have you tested the CPU in another board to be sure it is fried?

Idon't want to invest money in keeping my system based on the i7950. If I am going to buy a new power supply and MB, I'd rather move to the latest 6 core  as my 950 is already struggling to keep up with power hungry synth like Diva.  The marginal cost to upgrade processor just makes sense.