Bah, now I'm thinking about cancelling my 1070 order (the place I ordered it from doesn't have any in stock anyway, so it's anyone's guess when I'd get it and what price it would be) and buying one of those relatively cheap 1080s from OcUK instead.
I was initially planning on buying a 2nd hand card in the £200 region. The 7950 I'm still using cost me £100 second hand and was a very good buy. I thought I could get something quite good for £200 second hand. But no. So I thought I'd wait for Vega, but that's looking distinctly mediocre and very unlikely to be the quiet card I'm after. Besides, I only have a 650W PSU. A good one that really is 650W, but only 650W. I'd need to buy a 2nd PSU like it to power a Vega card

So I thought I'd buy a 1070, but by then 1070's had gone into the "we'll charge you silly money and we haven't got any anyway" territory. I found one a good one advertised for £350 and ordered it, but checked the small print for that business and found that the contract is made (and therefore the price set) on dispatch, not on ordering. It's up to £450 now. And they still don't have any or any idea when they will have any.
£450 for a 1080 is a decent price...but it's 3 times as much as I've paid for a graphics card before and that niggles at me even though I now have oodles of spare money and don't need to care. It just seems too much for a graphics card for me. Also, I wouldn't be able to find reviews of that particular card and I really want a
quiet card.
Or I could say "enough" and buy a console. They're not utter rubbish any more.
Or I could have a cup of tea and sleep on it. Maybe Vega RX will be an amazing surprise and not a bit below a 1080 in price and performance but hotter, louder and using 2 or 3 times as much power. Maybe.