what do you reckon? any suggestions to pieces?

Peters Edition do things like the complete Beethoven Symphonies for piano duet. All depends what style the players are into, and whether it's a major undertaking or a shorter piece that is being looked for...Dover editions might do a variety of this sort of classical arrangements too.

ALSO: Th ABRSM Haprpsichord etc. syllabus includes Ensembles, which include PIANO DUETS!!! How many of us have come across this I wonder! I've got a copy of the 2003 syllabus and it has a good number of duets, in three standards: 4/5, 6/7, and 8 (called Primary, Intermediate and Advanced). Worth a browse for lots of ideas!