[Mono-list] GUI and virtual grid for new desktop application

[Andrus Moor]

I'm planning to create new ERP desktop application which must run in 
Windows, Linux and Mac.
I'm planning to develop in Windows using C# Express 2008

Preferred requirement is virtual grid. This grid should displays screenful 
of data from a large tables using npgsql . When user uses page up/down keys 
to move, grid should retrieve new screen of rows from database.
WinForms DataGridView and its virtual mode are not implemented in MONO. 
GTK# does not seems to have virtual grid at all.
I can change virtual grid interface to something other if particular GUI has 
reasonable replacement.

Which GUI should I use, Winforms, GTK#  or something other ? Or is it better 
to use Java/Eclipse/Swing  since this is more complete than MONO ?

Andrus.