I wouldn't recommend 25/11 to someone who still needs an "awful lot of polishing" on 10/12...
Why only the Chopin etudes? There are many, many other fine etudes out there.
Revolutionary is low on the spectrum of difficulty, people... there are only a few Chopin etudes that are easier than it.I recommend 10-9, 10-3, 25-2, 10-6, or 25-7. Those are good places to start. Pick one or two and go from there.
Taking your advice, I started 10-9 last night. I learnt half the etude, at full speed, hands together in little under an hour.
THE most underrated Chopin etude IMO
Why only the Chopin etudes? There are many, many other fine etudes out there. Aside from the obvious and popular ones (Schumann, Rach, Prok, Scriabin, Saint-Saens, Liszt, Godowsky, Ligeti, Alkan, Stravinsky, Bartok), perhaps take a look at the etudes by Moszkowski, Gottschalk, Henselt, Gershwin, MacDowell, Grondahl, Busoni, Dohnányi, Liapunov.... <-- all great stuff!