Center to go with M10s?

DCombs
DCombs Posts: 3
edited November 2009 in Speakers
I have built out a HT room in my basement and am now starting to outfit it from scratch. I prewired for 7.1. I grabbed three pairs of M10s off Amazon for $69 a pair last night and am now looking for a center and sub to go with them. I'll probably get the PSW10 but can't figure out which center. My choices are probably either (cherry)
CS1 for $100
CS10 for $100
CS2 for $130
CSi3 for $130 refurb from Polk eBay

are any of these better suited to match the M10s than the others? From what I've read the CS2 sounds like it's worth the extra $30 over the CS1 and CS10, and those last two are nearly identical. Is that all correct? How does the CSi3 compare to the CS1-2-10?

Thanks,