Rear surround Recommendations

[bLU_ray]

I currently have Klipsch Rf-62's, Rc-52, RS-42's, and Bose 201's for the rears for my 7.1 setup. I want to switch out the Bose 201's with another Klipsch Reference series speaker (Nothing else!). the 3 choices i have are:

(2) Klipsch RS-42 http://www.klipsch.com/products/details/rs-42.aspx
(2) Klipsch RSX-5 http://www.klipsch.com/products/details/rsx-5.aspx
(2) Klipsch RB-61 http://www.klipsch.com/products/details/rb-61.aspx

I can get a pair of any for about the same price (~$200) range. The room is ~18X14. The system is 100% used for movies and i really want to take notice of the Rear surrounds. which would be best?

any advice is welcomed.