I enjoy, in this order --
1) anything Vivaldi (it's all excellent)
2) anything Franz Joseph Haydn
3) my "sinful pleasure" -- Rachmaninoff Piano Concertos 2 & 3
4) Beethoven Violin Concerto
I'm less enamored of Mozart and much prefer Haydn. Mozart to me seems very immature and flighty, whereas Haydn's music I find very mature and sophisticated. Perhaps there's some bias due to 1) Haydn having been a devout Catholic and 2) over-hearing Mozart. I find that Mozart has been so beaten to death that it almost seems to me as if it's all the same.
I much prefer Vivaldi to Bach. I did get a bit of Vivaldi fatigue from over-listening, mostly to the 4 Seasons, but then I found the recording by the Jєω Gil Shaham and Orpheus, and it was a very interesting take on Vivaldi that I very much enjoyed
I also enjoyed the Jєω Joshua Bell's rendition of Beethoven Violin Concerto.
Perhaps this'll give ammunition to Sean's accusation that I'm a Jєω
On the other hand, I find Itzhak Perlman and Isaac Stern to be both INCREDIBLY OVERRATED ... probably just because they're Jєωs.