If you want to play Romantic music, just go for it!Chopin - some Nocturnes, Preludes, Waltzes, MazurkasGrieg - some of the Lyric PiecesMendelssohn - some of the Songs Without WordsBrahmsI'm learning one of Mendelssohn's Songs Without Words - opus. 102 no. 3
oh and out or romantic, dohanyi's piano quintet no.2 in E minor (1914) is really really nice. reminds me of rachmaninov so if you can get a hold of that it's yum.