Yamaha’s keyboard/ digital piano (compare to Casio)?

I have been playing acoustic piano for over 5 years and I'm interested in buying a keyboard… ($ and performance are both my considerations)

(1) Is 76-key enough?
(2) What should I look for in Yamaha and Casio? (in terms of $ and performance)
(3) What is the difference between the Yamaha YPG and DGX series? They all have 3 models – with 76 keys, 88 keys, and 88 weighted keys…
(4) What about Yamaha P70 and Casio WK110?

Thank you very much for your help!!!
thanks John!

my budget is around 0, definitely no more than 0

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