Well I flirted a bit with a Haydn concerto in D Major, and the Kabalevsky in D Major (I think), and I learned some of Rhapsody in Blue, but the first concerto that I actually perfected, so to speak, was the Gershwin in F Major (1st movement only, the others are boring IMO). I fell in love with that piece. Haven't performed it with an orchestra but I came close in a competition I entered. I will probably tackle the Grieg, mvt 3, next.