Dover publish three volumes which contain:All the preludes and études (I own this and can recommend)All the sonatas (also published individually by Henle Verlag, also in a few expensive volumes by Bärenreiter)All the other misc. pieces for piano
I just checked the 3rd and it says the 3 volumes contain "all of S's solo piano music with op. numbers (plus 2 posthumpously published works"). It doesn't clearly state whether there's more without op. numbers that's not included?But anyway, these 3 books are well worth the little they cost.
I looked at some of the reviews... Some say there are many errors, especially in the 3rd misc book... I'm leaning towards peters atm but if anyone else knows of some great obscure edition... please come forward.
i'd just start buying works up from a list of complete works , not sure why it has to all be from same publisher, i like the konemann volumes if you can find them. also i really like the imc volumes i have, in particular for the Fantasy and polonaise. Henle puts out a few good ones too.i then have an mca copy (too bad they're now defunct too) of the complete sonatas, so bit by bit i just piece it together, way either than sweating trying to find them all by the same kids.