Andrey Rubtsov is brilliant, I love his Romantic Sonata for piano.
If you like light-hearted, sometimes comical pieces, check out Philip R Buttall - as well as his own original compositions, he adds a twist to some famous classical works, often in piano duet form. For example, the primo player plays Mozart's Rondo Alla Turca, whilst the secondo player adds a samba accompaniment! He also arranges these piano duets for various different ensembles. Here's his page: www.prbmusic.co.uk
I particularly recommend The Lone Arranger (any arrangement, there are many to choose from).