Fisklingur, welcome to SZ. My main instrument was also piano. Here's my experience with some of the boards you mention. I had a DGX 505, it has some nice features but I wasn't totally happy with the the keyboard action. Yes it has 88 keys but I found it difficult to play with the dynamics that some piano solo music requires. But it was easy enough to transport to playing background music that I play on gigs. For my use it didn't have enough variety of styles/arranger features. I traded it for a Casio Privia PX400r, which I still own. This has 88 keys and a much better acoustic piano type action and for the price it is a good value. It works for playing piano solo stuff, its' styles and arranger features are fair at best IMHO. I have at home for home use the Yamaha Clavinova CVP 307. This is the best of all worlds for me great piano sound, action and arranger features. There's lots of good choices and others have talked about them here, best bet is to try to demo as many as you can.