Here are some Strange feats from a comic: Doctor Strange and Doctor Doom: Triumph and Torment.
Strange making a shield that can stop the power of three sorcerers, multiplied hundredfold, in a second.
Strange defeats Doom with a simple gesture.
http://img133.imageshack.us/img133/4690/strangefeat23da.gif
With small effort, Strange teleports both Doom and himself to Hell.
Strange breaks through an illusion.
How about some durability feats?
First a few without his major shields, and only his everlasting auto shields. They are always up unless the plot/writer needs them down.
Anyway, he takes a full on punch to the back from Jug. Jug comments that he "put holes in traliors with that punch", Strange is up and about a few panels later.