klipsch speakers question...

[awolpoland]

i plan on getting the
rf-52 fronts
rc-10 center

my question is are bookselves able to be used as surrounds like the rb - 51's that are cheaper than the surround speakser the rs- 42 that are rated at the same power, but keep in mind it is a 7.1 system so i would need 4 of the book selves or surrounds.

my queston is what would be better and im on a tight budget so for the little bit less money would the bookselves prove to be good enuf over the actual surround speakers they sell??