i recently picked up my first pair of speakers in the SDA CRS. i'm thinking of a surround system with possibly RT-5 rear speakers and was looking at center speaker. someone is selling CS175i in my area for $40, and my other options are CS245i or CS400 but those arent local. the CS175i isnt in the vintage forum search so i'm kind of stuck. can i get someones opinion on this? thanks.