Also check out Bach's 4th concerto in A major. I only recently discovered this piece (Gould's recording of course) and am very delighted with it!
Mozart concerti are generally not inclined to stretch the usual limitations of the orchestra, and indeed for something a little bit mainstream (but not too much so) I might also recommend Beethoven's light 2nd concerto, my favourite of the set personally. The John Field concerti are similar to those Classical concerti, but definitely have some quasi-Romantic features, mostly in technical requirements (though not hard).