Hi all. New to the forum so please excuse me if I mess up on some of the protocal or step on any toes. As my title indicates, I have a pleasent dilema. I'm running a Yamaha RX-V1800 (firmware updated) in a 5.1 setup. TSi400s for the fronts, a CS10 at center, two TSi100's at the rear and a Velodyne DLS3750 for my sub. I just picked up a like new pair of TSi200s at a flea market for a song and want to incorporate them into a 7.1 setup on my Yamaha. Any input from any of you as to whether I should keep the 100s as the rears and use the 200s on the side, or move the 200s to the rear and use the 100s on the side. I would think the timbre on all the speakers should be somewhat matched. Any suggestions?? Thanks to all.