I would wait to see what happens when the 1100 series come out (if they are called that) I'm pretty sure that most 1060 or higher cards are still currently slightly over the original RRP, it's down from 200-300% of RRP but still over RRP.
Here's the MSRP / cheapest on scan
gtx1080ti is £679.00 / £689.99
gtx1080 is £529.00 / £489.98
gtx1070 is £379.00 / £389.99
gtx1060 6gb is £279.00 / £239.99
I'd say that the gtx1080 might not be that bad an option, but overall the cost is still overly high from where it should be when new cards come out