Performance of GTX 1070 6gb GPU for mining

Guys can you please help me to select mining GPU for Ethereum. Currently in India all GPU which are best for mining are either out of stock or over priced (3 or 4 times) like RX 570 or RX 580, RX 470 or RX480 and others as well. So i'm not able to assemble these H/W for my first mining rig at home.

Recently I got a offer of GTX 1070 6gb whose price is same as RX 580(i think its overpriced). So I want to go with GTX 1070 6gb for mining. But problem is that I searched all over youtube & google but didn't find any article or video which review GTX 1070 6gb mining performance. So I'm confused whether 6gb version of GTX 1070 offer same hash rate( 30 Mhs to 32 Mhs) as 8gb or not.

Could you please help me here with your experience, whether should I go with GTX 1070 6gb or not in terms of there hashing performance with respect to power.

Thanks in advance