Here's a review of the 4 pairs of mirrors I tried. On a scale of 1 to 10:
Stock: Looks (3) Function (6) Price: Free
Rizoma: Looks (10) Function (5.5) Price: Over 200$
Plastic mirrors: Looks (8) Function (1.5) Price: 15$
Aluminum bar end mirrors: Looks (7) Function (11+) Price: 5$
Winner for price and function: Bar end mirrors. Winner for looks: Rizoma hands down.
I'm going back to my bar end mirrors it's by far the safest mirrors you can have, they are barely visible when people look at the bike sideways and are dirt cheap. I prefer sacrifying a few points on looks and keeping my bike in one piece then having nice looking mirrors on a rear ended bike.