If you want the best board for the price range you mentioned . Here it is , as well as a link for the second best
this one has gen3 pcie3.0http://www.newegg.com/Product/Product.aspx?Item=N82E16813131806&Tpk=asus%20maximus%20iv%20gene-z%5cgen3
This one is just as good w\o the pcie3.0http://www.newegg.com/Product/Product.aspx?Item=N82E16813131759R
If you get one of these boards you will have the best of the best and you will definately be pleased with it.
The second link is an open box that is out of stock but I just linked it so you could see the board.
You can get a deal on them if you do it quick herehttp://www.ebay.com/itm/310372848432?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
With the asrock boards your price is cheaper and you MAY get a good board. Allot of people are having trouble with memory or pci slots not working in them. When all works they are an ok board.
At least with the maximus there is less chance of a bad board and you will have the most stable system board for your money. not to mention all the cool features.