i am building a cheap mining rig and i have found a couple of offers.
 1. palit gtx 1070 super jetstream 390€
2. asus rx470 4gb strix 220€
3. sapphire rx480 8gb nitro+oc 260-280€(depends if the owner lowers the price)
4. i can also get a gtx970 for 190€ but i think rx or newer gtx cards are a better deal here.

i'm mainly looking here at rx480 and rx470 since they are quite cheap, but which one is better and what are avg. hashrates achiavable with these cards.

thanks!