I'm doing G5 this year, then G6 this Dec or Next year. I hope that when you said "Classical" you weren't being to specific as I also favour Romantic and Baroque pieces. Although the Latter was obsiously written for other keyboard instruments.
Fav pieces:
1)Toccata (BWV 830)-Bach
2)Piano Concerto in D minor-Mozart
3)Liebesträume- Lizst