Come on.... You expect me to believe you shelled out for the Sharp 4K monitor with the new Mac Pro and didn't do any research first, and now you're upset that the fonts look small on it, etc. And NOW you're asking MacRumors for advice on alternatives to it?
IMO, it's pretty clear that 4K displays are the new, over-hyped thing to drive display sales, and just like 3D HDTV, it's only going to matter to a niche segment of the market unless prices drop so far, it becomes pretty much standard-issue.
From all the reviews of the new 4K display offerings I've seen so far, you're looking at the classic immature marketplace. You've got far more vendors promising new models than actually selling them, and left and right they're trying to sell you less than 4K pixel resolution but call it 4K anyway by "rounding up". Half the stuff has synchronization problems with the new Mac Pro too, right now. As usual, Dell is out there trying to offer a product before most of the others are ready and at competitive prices, but it's going to be in a typical, ugly looking enclosure and you'll regret buying the first model instead of waiting until later in the year when it's replaced with better versions at half the price.
I'm interested in a new Mac Pro myself, but not going to bother spending much on displays. IMO, you'll do great with a pair of 27" IPS panel displays from Samsung, Dell, HP, or any other similar vendor, coupled with a good monitor stand designed to VESA mount both of them. Don't bother with any of Apple's Cinema Displays unless you get some steal of a deal on a used or refurbished one. They're way overpriced just to have the matching Apple logo on them.
Honestly this guy does not need advise, sorry but he's just a bragger. I don't care, even if I was rich I would still research things. Get a couple of NEC 27/30" monitors and in a year from now, 4K will be a different level. Mr tong out of interest what would you use 6 apple monitors for?
P**n! X6. #