NOD32 is great, I am using it now and I intend to stay with it too...
Uses very little resources, feel safe, a lot of updates (virus definitions updated almost every day) and really do find things if there are any.
As for firewall, well I can't point out a winner there. I'll leave that one for someone else.
As for imaging... Not my thing to do. I prefer a real clean format when its needed instead of some image thing.