Center Speaker Input

[igotcabada]

I'm looking to replace my center speaker, only problem is that I only have 18 1/2" (width) to work with . This gives me very limited options.

My current center speaker is from an onkyo htib purchased for about $500 3/4 years ago.

I'm looking at the following

Boston Acoustics CS 225C
http://www.amazon.com/Boston-Acousti...ref=pd_ts_e_35

Infinity C250
http://www.amazon.com/Infinity-Chann...&s=electronics

Polk CSR
http://www.crutchfield.com/p_107CSR/...SR.html?tp=189

Am I going to see marked differences in any of these speakers from what I have now? Anyone have experience with them or have any other suggestions?

Thanks in advance.

For reference, current set up is:
Polk T90e Fronts
Polk PSW10 Sub
Onkyo HTIB Fronts have been moved to Surrounds

-Mark