Hey Gurus I'm thinking it's upgrade time. You might think I'm mad, but I'm looking at X99, mainly for Windows 7 compatibility for my recording stuff. I'd also prefer it over Zen (presently) for the ability to do efficient dynamic overclocking, which AMD STILL hasn't sorted. I've got the option of getting a 5820K, 6800k, or a 6850k all for about the same price. Which is the best to go for in terms of IPC and OCing headroom? I know the latter has more PCIe lanes, but that's really not that important to me. Thoughts and motherboard suggestions, please.