Looking to put a decent scope on my 10/22T for $150 or less. Looking at the BSA sweet .22 6-18, or the Mueller APV. What do you guys think?

Stay away from BSA like its the Plague.  

I've heard good things about the Mueller scopes but I have no personal experience with them.

I like small, compact scopes on .22s and have always liked the Weaver rimfire line.  Also for that price range you could look into a Nikon Prostaff 3-9x40.