My 2070 was $469 after rebates. The cheapest Vega 64 I could find was $420. That's within $50 of each other.
After my 390s, which hit 94c and throttled NO MATTER WHAT, I was really turned off by AMD cards, but thought I would see what the RX 5 series and Vega offered, and it was more of the same. Power hungry, hot, over-clocked previous gen cards with very little improvement. I'll see what Navi is like, but I've really lost hope with AMD.