I don't want to a bad choice and regret later.
Priority - Keys
Sound Not so much
It never works that way round. You will not save money by compromising sound while prioritizing action. The absolute top quality actions are always, always, always, fitted to digital pianos with top quality sound, and at the top of the price range. So you can find a digital with excellent sound and ok or maybe poor action, but you will never find a digital with the very best action and poor or just ok sound. Digital piano companies don't ever market that way round. And for good reason, because only a very discerning player appreciates the nuances of the best action, but everyone can hear poor sound.
You will find the majority of decent digitals have decent weighted key, and sometimes even graded keyboard action and I don't think it should be an issue for you. If you live in or near a decent sized city, you should be able to go to a piano store and try a few. And unlike the general large music stores like The Guitar Centers, sales assistants in piano stores are usually knowledgeable and genuinely helpful. And prices are always competitive with the internet - they unfortunately just have to be to survive. A little unfair considering the store provides real help and opportunity to compare, but that is the real world today.
I recently bought an excellent Yamaha digital with full piano consul, and a good looking piece of furniture, for my grandchildren for around 1000 dollars. The action quality is similar to the portables available around 400- 600 dollars, and perfectly acceptable. Is it as good as my Shigeru Grand that cosy about 80,000, of course not. That qualityof key action is actually available in a digital, and for much less than 80,000, but still way outside your budget. But its a lot better than the old uprights I and most others learned on, or played as a pro for many years.
Mike