Right now I have an Onkyo TX-SV414 Pro receiver with two Infinity Sterling SS-2005 3-way speakers. I think I got the receiver in 1994 and the speakers in 1995. Both seem to be doing an okay job and I'd like to add a center channel and a couple surrounds to the mix. Since I have Infinity speakers already, I've been thinking about getting the Infinity Primus C25 for the center and either the Primus 150 or 140 for the surrounds. The living room in my apartment is only 15'x14' and I'm going to mount them on the wall behind my couch so I thought the 140s might suffice. I listened to the 150s at CC and they sounded nice, but they are a little big. My dilemma is, do I get the 140s since they wouldn't be so freaking huge or go for the bigger 150s? If I can find a place that has a cheap enough price, I might replace my SS-2005s with the Primus 250 or 360. My 2005s sound good and put out plenty of base so I doubt I'll replace them. Does anyone have some suggestions as to which surrounds I get?