A friend wants a digital piano, knows nothing about them, and has $2,000 budgeted for it. I may go with them to look, but I don't know a whole lot about them either, other than some I play on I like, and others I don't like. What good types could I get in this range?? I like the nicer Clavinovas I've played on, but again, my experience hasn't been a whole lot with it.
You [and they] have to try them - some folk love Roland over Yamaha, others see it the other way.
For the budget they should easily get a good one.
The makes to look at are pretty well known [roland, yamaha, kurzweil, korg, kaiwai etc] and well covered [look at
https://www.harmony-central.com/Synth/Data/ for user reviews, google groups for a bunch of "Which digital?" threads, mebbe even
www.purgatorycreek.com [see the digital piano shootout link] for a piece played on lots of them to compare the sound]
Personally [i.e subjective opinion follows] - I'd go for the best bang for the buck - avoid fake wood furniture and built-in amps [if being loud and sounding good matters a separate amp should do both better. If it doesn't, decent headphones are the best way to listen anyway] and throw the money you save over spending the full budget towards a real piano [or lessons, books, nights out

]
i.e I'd go for a stage piano, a good double braced stand and a decent pair of headphones -
e.g, using Yamaha as an example - something like the p90 [with separate amp or through a hi-fi or just through headphones, as it has no speakers at all. It's pretty cheap in the UK now too, I dunno about USian prices though] It has one advantage over the p120 imho in that the 2nd variation on the main piano voice is a more mellow piano rather than a brighter-still ones, purgatory creek has a sample of both]
Or the p120 [which has built-in speakers that aren't particular good or bad - they suffice for a lot of people who have digital to practise on at home] - supposedly the best selling digital piano there is.
There's nothing wrong with paying more, but it's arguable whether by doing that will get you closer to a piano [it'll get you stuff like sequencers, extra sounds, bigger speakers and fake wood though so if those matter then go for it]
Hence I'd say the P250 is possibly overkill - but you need to listen to both and judge the usefulness of the extra features and whether the sound is any better.
If furniture style though - that budget might stretch to one of yamaha's Grandtouch series? [I'm not 100% sure, it's that currency / country thing] if so, they are basically a real Yamaha acoustic action [hammers et al] but a digital piano - I've never played one or compared one but it's closer to the idea that manufs should get to - i.e something where the more you spend == the more like a piano it is, and only like a piano rather than the fancy pants farts beeps and blinking lights they put on them

The only downside with the GT is that the polyphony is only 32, which typically the lore recommends 64 as the minimum to go for.
The clavinova range is newer now [that is, the p60/90/120/250 stage models are all the same as one of the CLP 110/130/1xx models - if you study
https://www.yamahaclavinova.com you'll see that from the features] but now they've just bought out new CLP2xx models - I don't know if that's a sign that they'll bring out some new stage pianos soon - it might mean your friend could find a good deal on the outgoing stock though if owning the latest / greatest doesn't matter. The main difference on the new models is they have the GH3 action which supposedly adds extra sensors to make fast repeated notes easier to articulate.
HTH.