What graphics card should i buy?

I literally just got my tax return from 2013 a week ago (screw you IRS). And i have some serious cash to make a tower. My motherboard is an ASUS X99 Deluxe LGA 2011-3 ATX Intel Motherboard http://www.microcenter.com/product/437350/X99_Deluxe_LGA_2011-3_ATX_Intel_Motherboard

And my processor is an Intel Core i7-5820k 3.3 GHz LGA 2011 V3 Tray Processor http://www.microcenter.com/product/437203/Core_i7-5820k_33_GHz_LGA_2011_V3_Tray_Processor

These are some very nice, and very new pieces of hardware. Can anyone recommend a quality graphics card around the $500 mark? Doesn't have to be that expensive, or it can be a little more. I just want something really nice for this machine. Thank you very much!