It varies from guy to guy.
I would imagine most men are more attracted to a specific body type as oppose to a certain hair or eye color. A beautiful smile and a great personality with a similar sense of humor is also a good thing.
However as I stated you can't make a general statement. Just about every size woman, short, tall, thin, or obese can be spotted with boyfriend/husband at any mall, park, or movie theatre on any given day.
Apparently there's some truth to the old statement:
There is someone for everybody! :-)