What's crazy, is that the second hand 980 I bought 24 months ago for £100, is now 'worth' over £200. And it's not even a TI!3070. Nothing fancy, I agree, but I'd have to throw my right kidney in there too for that.
Always had good luck with the "7s". My old trusty 970 still runs like a champ as long as FD isn't even remotely involved in it.