Should I trade jay cutler for brian westbrook? I'm tied for 1st in a 12 man league?

Mcnabb would be my qb the rest of the year. My running backs are peterson (minn),chris johnson (tenn), williams (car)..my wr are colston,boldin,holmes,gonzalez (indy), walter (hou), and gage(tenn). I feel that this would make me the best team in the league with him on board. What are your thoughts? thanks