Thanks again for the answers.
Okay, so I tried the 515 in a store a long time ago and I actually have very good memories of it, it felt pretty good, but I only played one or two pieces on it, i.e., not representable for normal musical situations. Didn't realize that 525 is out, sounds interesting, yeah.
About velocity curves, I just change them in my DAW, it's very easy.
Studiologic I bought some years ago but had to send back, think it was sl88. Maybe I just had a bad day but I remember being disappointed with the way the action behaved. Should tried everything with the curves, maybe I decided too quickly, don't know.
I bought my vpc1 few years ago for about 1.3k€ (new). For 2.2k$ I think I wouldn't have bought. I understand some context now! For me vpc1 was always like the best option for about 1k. But if it's 2k or even more, everything changes.
Again, I'm really pleased with the vpc1+Garritan combination, and I couldn't even think of how an improvement would look like, because I'm so used to it, but will check the Roland and Yamaha out.