Thinking of a 4070 - few questions.

[Cully]

HI guys, im considering a new build later this year although [ive said this the past two years but somehow my rig still holds up very well with 90+ fps in most games with a few settings lowered depending on game].
Anyways im still running an 8600K @4.5 ghz and a 1080TI @ 1440P, my undserstanding the CPU is even a bottleneck for my 1080ti again depending on game.

With the current prime days i was thinking of buying a 4070 , that way i will have the most expensive component in the bank.
I have a few questions.
Will my 650 watt corsair PSU be sufficient?
Is there any real point using it on this rig or should i just bank it for a new build?
Finally can we expect prices to drop further than what is on offer in this prime sale?

 

[Cully]

Ok bit of a change and possibly a weird one, but a friend suggested i do what he has and keep the 1080ti and run with a good quality CPU.
If i were to go with a new build it would probably be a 7700X or 7800X3D , my friend is running a 13600K with his 1080ti until we see what happens in the GPU market.
Would this be an option?