Does anyone have any insights into what are the better Roland Pianos regardless of age.
A friend of mine had one of the original RD series and I enjoyed playing on it even though it wasn't mine.
I recently purchased a used FP-4 and find the feel and sound of the Acoustic Piano to my liking.
I find the Roland system for numbering keyboards and newer models as opposed to older models somewhat baffling.
So which ones are the better ones?

The current best Rolands have "SuperNatural" sounds. The best Roland action is PHAIII. Cheapest version satisfying both is the FP7F, I believe. The RD700NX is a premium stage piano, it has tons of sounds and features.

Though I was just listening to a bunch of Rolands from the pre-SuperNatural era and their sounds were also excellent. I'm slightly less impressed with PHAII.

I have nearly zero experience with digital pianos but of the ones I've seen at the local Roland/Yamaha dealer the FP-7F was my clear favorite. Even through the built-in speakers it sounded better than, say, a rental upright acoustic piano. All of the other digitals (the Roland '305, Yamaha P95 and one of the "Arius", a Roland F-110) were very tinkly sounding through the built-in speakers. Worse than a rental spinet piano.

I like the keys on the FP-7F pretty well but actually preferred one of the "lesser" Roland models for feel. Even the FP-7F keyboard was not as easy and fun to play as some of the el-cheapo upright acoustics.

So I agree the FP-7F is a good starting point. It's the only digital piano in that shop I would have considered buying...if I had $2000+...and I wanted a digital piano...and I didn't mind it being on a stand instead of in a cabinet. It sounded really good as is, through my good Sennheiser headphones I'll bet it was awesome.