First, I am a big supporter of going after Kevin Martin, I think it would be a great move. I'm sure the Celts could turn him into a serviceable defender. Look what they have done with Ray.
I am not a fan of Nocioni or how he would fit with the Celts, really. But why not go after Beno Udrih instead? That would solve our backup PG woes, allow House to fully be a backup SG, and provide a solid bench unit when the team is fully healthy (you know, if that ever happens, which is unlikely).
Udrih makes a lot of cash for a backup PG, but I'd rather overpay him than Nocioni, I think.