Looking to add more rx 470

Whats the best bang for the buck nowdays. I currently use sapphire oc+ 470 8 gb, and am happy with them ( 29.8mh/s ). I can find these still around $220 usd.
I have seen some msi 470 4gb gaming cards for $160-180, and others like it.
Maybe the sapphire 480 4gb oc+ @$210?

Thanks !