IMO, the Ravel concertos are both amazing.

Have you taken a look at Beethoven?? The first and third concertos are popular and are good introductory concertos of you have a solid foundation working for you.

Maybe Liszt's 1st concerto or Schumann. Chopin 1 is much more difficult than those 2 technically imo. WHat about Beethoven 3rd? OH... maybe you can try Gershwin's concerto

I'm doing Totentanz now, a great one-movement Liszt piece that's a lot easier than it sounds.

Is it easier than it looks? i just glanced at it on IMSLP and almost fainted...

I know someone who learnt the Prok 3 for their first concerto.

The first movement of Prokofiev 3 can work as a "first" concerto. Someone with solid technical training can handle it, and musically it's attractive and straightforward. The 2nd and 3rd movements are far more awkward.

Many seem to be focusing on what others have attempted. So what if someone played Rachmaninoff 3 at age 15 or if Tchaikovsky won last year? That's not a reason for choosing repertoire that's well above one's current abilities. I'm all for challenging yourself, but not for setting yourself up for frustration and failure. Let's face it, there just aren't any standard medium-diffiulty "big" romantic concerti. Zero. Among the "easiest" is Grieg, and it just goes up from there. There are several of classical concerti and a few 20th century concerti that fit, but nothing in the 19th century.

It's certainly not easy but it's definitely manageable! A lot of the flourishes are just the same pattern repeated over and over again, for example the cadenzas which open the piece.

Rach 2 might work... I think it flows in the hands and prok 2 is way harder than rach 2 btw. Judging from your "repertoire" the following shouldn't be a problem...

More manageable stuff would probably be:

Mendelssohn's Capriccio Brillante
Grieg's A minor Conecerto (even though I think u said this might be above u)
Schumann concerto
Weber's piano concerto
Dvorak's Piano Concerto (one of my favorite unknown romantic concertos)

I don't get why you just don't do the Grieg? It's romantic, fits well in the hands, and your "repertoire" is definitely on par or above technically to the Grieg. The Schumann works too. You sound so hesitant to learn anything and you almost imply you just want to play Prok 2 or Rach 3 or something hard saying that you want to play something of this magnitude. But in all honesty just try out some of the suggestions, and play them all and see which fits a comfortable technical and musical level.