One thing you have to consider is we don't actually know that bigger cards will be out by Christmas. I'm personally just going to assume no sane priced big cards until around this time next year.
We know one of the Vegas will be here by October; most likely Vega 11 which will be the smaller one - which will more than likely match/beat 1080 with large Vega; Vega 10 - coming most likely early January which will replace Fury line and go after P100.....