Korg Kross 2 88
I'm a professional musician and I'm finding that I really enjoy playing the Korg Kross 2 88 key model.
+1...
Ive been looking at the Yamaha MX88 as well as the Korg Kross but they both look quite old and am unsure if I should consider them.
The Kross 2 88 is not old, was only launched late 2017.
Others to consider for your budget would the Casio PX-560M, which has quite beefy built-in speakers, or the new Casio PX-S3000, also with speakers but not as powerful. The PX-S3000 comes with a new app from Casio that is quite interesting when you want to learn the piano.
Similar to the Kross 2 would be the Roland Juno DS 88, but both are more workstations/synths than digital pianos, whereas the Casio boards are more piano oriented (which, I assume, you're looking for).
If you want a digital piano with a really high quality keybed action, then I suggest you take a look at the Korg D1 : it's got Korg's best keyboard action, but the downside is that it hasn't got internal speakers and not a lot of sounds, and you can't split the keyboard. Still, it's only half your budget so that would leave you more than enough money to get some decent speakers or an amp, and you can always add sounds in software, iPad, DAW or whatever.
Others to consider are maybe the Kurzweil SP6 : haven't played it so can't comment, but have heard lots of good things about it.
Personally, I'm very fussy about the keybed, so my money would be on the Korg D1, best keybed of all the ones I've named, but it's quite basic so you're actually paying for the keybed and not much more (although if piano's really your thing, the built-in sounds are more than enough). But if you can stretch your budget (quite a bit), then you should look at the Kawai MP7SE. I think, for the money, it's got the best 'piano feel' of them all.
This is my personal view : I'm only getting back into music after a very long time and didn't really know what kind of keyboard I wanted. All the reviews on Youtube and reviews on the net made me salivate when I saw what you can do with modern keyboards (all of these were workstations). So I have bought several over the past few months, and sent every single one back, except for the Kross 2 88, which somehow has grown on me. But honestly, if piano is your main interest, don't bother with workstations and keyboards with large screens, they'll just confuse you. A good digital or stage piano and an iPad on the music rest is all you'll need. But don't take my word for it
Edit : just seen your last post, suggesting you need more features than digital pianos can provide. You'd be looking at workstations, then.