Using the same video cards, the gaming performance between a 2500K on the cheapest of the boards above compared to the 2600K on the priciest will probably be 5-10% at most. If you put that same 300$ toward better video cards, you can probably get 25-50% more FPS.
Why would you waste your money on the UD7? It doesn't even have the EFI bios
UEFI* Bios are a sham. Basically they are making the bios more ascetically pleasing to look at and navigate. The UD7 over clocks faster then the maximus from ASUS. Mainly because the new bios are still extremely buggy. I would rather go with proven hardware then shiny and glichy.
If you want the best board available get the UD7 hands down it is currently the king. Maximus has a price tag that matches but has half the features of the UD7.
UEFi Bios =
at least until they make them seamless and work the kinks out, then I will be open to adopting them fully.
Also if you want the best graphical experience. I would get 2x gtx 580s they are amazing cards. The 5770s are awesome cards for their price range. But if you want the best of the best the 580 is my recommendation for you. If this is not the case then looking at the UD7 from Gigabyte might not be worth it to you either
The main feature is that the UD7 can run duel gpus at x16 pci maximus goes down to x8 x8 right away.
As for bios, your telling me you would rather have each company putting out different versions of bio's instead of 1 type for each company ? Some uEFI bios might be really good but there are too many bad versions out as well.
Should we remind the OP to wait for revised boards to be released with the "fixed" chipset?
Almost all the boards being sold by main stream venders now (newegg, microcenter, tiger direct) are B3. Unless you buy from a "sketchy" vendor or ebay you shouldnt need to worry about the sata corruption problem at all.
In the worst possible case, enfaces on worst, you get a board with the problem. SATA ports 0 and 1 work perfectly on the older boards. All of them. This is still unacceptable, but far from being unusable.
No offense but crash isn't a major player in the overclocking game. He's no Shimano
Sigh, I apologize for offending you. From my current knowledge I do not believe the Maximus to be all its cracked up to be, and I can be wrong in this. Wouldnt be the first or last time. I have used one and they are nice to work on. My brothers new rig has one and its nice but he said he wished has had spent the extra money on an ssd instead. (which he doesnt have yet) and just gone with the deluxe version. Take this as a grain of salt though this is just 2 peoples perspective.
If it makes things better at all then Ill say this. Both the Maximus and the UD7 will fit your needs as a high end user.