Seriously guys. If you started Mars? (wth is mars) this year, i suggest a Mozart Piano Concerto. If anyone dare says that they arent difficult enough, ill shoot ya lol. I think that mozart can really be interesting if shot at correctly. Hes classical so you have to really disapline yourself...but i suggest doing it because of the short period of time you have been playing. Rach will just kill your fingers, and Shostakovich...well the 2nd movment wouldnt be too bad. Just...yea, try going to the library..or even free-scores.com and look at the concertos that are on there.
and greig...hes good.
Free Sheetmusic Library An excellent site to get sheeet music from. There are 3 composers on there that have All their concertos uploaded - Brahms, Beethoven and Tchaikovsky.