I am in the market for a new GPU, and I need to know whether

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I am in the market for a new GPU, and I need to know whether an RX 470 or RX 480 would fit my needs.

I have two 4k monitors in extended display, with one being used for gaming @ 1080p or 1440p, with the other monitor to do stuff in between.

There is an MSI Radeon RX 480 Gaming X 8G that is available for pre-order and will be available August 30th, so I'll probably be able to get my hands on it sometime in mid September. Here is the link:

http://www.bhphotovideo.com/c/product/1271034-REG/msi_radeon_rx_480_gaming.html

There are also three 4GB RX 470s available right now on Newegg:

MSI Radeon RX 470: http://www.newegg.com/Product/Product.aspx?Item=N82E16814137024&cm_re=MSI_Overclocked_470-_-14-137-024-_-Product

SAPPHIRE NITRO+ Radeon RX 470: http://www.newegg.com/Product/Product.aspx?Item=N82E16814202229&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-Veeralava%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=6202798&SID=

XFX Radeon RX 470: http://www.newegg.com/Product/Product.aspx?Item=N82E16814150777&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-Veeralava%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=6202798&SID=

I can't really tell the difference between those three 470s, but from what I've read, the 480 isn't significantly better than the 470 for a $70-$90 price increase. My question is: which of those should I get? My intention is to keep the new card for at least 3 years, as that's how I've been with my previous cards.