SF-1s as rear channel speakers?

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I have been looking to upgrade my bedroom home theatre for several

months. Ive asked about it here before, and have received some

good advice, but I still have more questions.

Its a small system in a small room, so I dont need anything

fancy. I plan to stick with my main speakers (KSF 10.5), Purchase

a center channel ( I dont have one right now ), Replace the rear

speakers which currently arent very good, and eventually upgrade the

subwoofer (Ive never been completely satisfied with the KSW-10, but

getting a new one is a low priority). It would be nice

(preferable) if the speakers accompanying my 10.5s had the cherry

finish to match; In my opinion. The cherry looks so much better,

especially in how it blends with my furnishings, compared to the

black. The most important thing is that all the way around they

are acoustically matched

Since Klipsch discontinued their KSF line several years ago, Ive been

searching the Internet (mainly eBay) to try to find a used C5 center

and a pair of KSF-S5s with no success. It seems those speakers are

difficult to find in the used market.

A few days ago, I was looking through the selection at the local Good

Guys (Theyve said that theyre going out of business and are trying to

liquidate all of their inventory), I found that the have a lot of SF-1s

in stock. Most of their going out of business prices arent that

good, but theyre asking only about $150.00 a pair for the SF-1s.

Ive done some research, and it appears the SF-1 is the replacement for

the KSF 8.5. From what I remember, the 8.5 is identical to the 10.5,

except it has one less 8 woofer. The tweeter looks virtually

identical.

What would happen if I used the SF-1s as rear speakers? Assuming

of course I can find room for them (which may be a big problem). This

seems like it might be overkill, but I can always turn down the volume

in the back. I know these arent multidirectional like the

standard Klipsch surround channels. Would the difference in these

compared to the KSF C-5s or the newer version be that much different,

especially considering the price?

Or am I way off base here?

I've also considered bookshelf speakers; thats what I have now, and

while the quality of the speaker itself is poor, it does deliver that

sound to my ears pretty well.