rear speakers?

tecmo04

right now i am using some polk r 40s as my rear speakers, facing each other a few feet behind the sitting area. i realy dont feel like im getting the best sound i can. i also have a pair of bose 201, and bookshelf infinities. if i use the bose, i would like to mount them a about 8 feet high and have them fire foward, and bounce off the back wall.

i guess what im getting at is which setup will give me the best sound??