Hello there,
Via Due is the newer outgrowth of Via Carducci, correct? I haven't been to Via Due, but have always been very pleased with the food at Via Carducci. I believe that Via Due serves smaller, more tapas style plates of food. I could be completely wrong, however. My favorites at Via Carducci have always been their pastas with nicely flavored sauces. So, perhaps you can steer toward something like that.
When you do go, please post on what we can expect at Via Due.
Enjoy.