We have a KEF THX package/ Denon AVCA1SE. Our room is rectangular: 4.5m x 3.2m. There is only enough space on the rear wall for one speaker. Should we use a single KEF TDM34DS or a single KEF 23C ? Testing is hard because we only have one TDM23C and one pair of 34DSs ! The TDM34DS is the more aesthetically pleasing option... Suggestions please ?