QD OLED only comes in 55 and 65 and since they did not mention a price, you can expect this first gen to be very high. The interesting thing is, they say it is less costly to produce than current OLED, but with it being a new tech, the production yield isn't known yet. Yield has traditionally been low on OLED, which is part of why it costs more. That is improving which is why the prices are coming down.
If you haven't seen current LCDs, you might be surprised. The blacks are still not as good as OLED or Plasma, but they're definitely brighter. The newest LCDs, which are MicroLED backlit are supposed to come close to the blacks for OLED. I've only seen one on display in the store and it looked pretty impressive actually. LCD does not have color bleed like OLEDs do, so there are always tradeoffs.
What would I buy right now? I would probably wait another year if you can and jump on that QD OLED bandwagon.