KEF Reference Series 2

Does anyone have feedback/opinions they can share on the KEF Ref series 2 models? In particular, is the main difference as you move up the line simply one of low freq extension? I read the reviews on the 207/2 and 201/2 in sphile and Soundstage and the freq response is amazingly flat, very impressive. Sphile also stated that teh 207 had pretty impressive dynamics, does that hold true down the line? Also, the one thing that kind of worries me when considering these speakers is the tri-wire capability when I'd only be single wiring. There has to be some penalty to be paid for having to use the terminal jumper cables. I wonder if there is any differences between the direct connection going to the mid, high, or low terminals? Anyone have any experience experimenting with that? BTW, I have a fairly small room, 14x18 and am considering either the 201, 203 or 205. 207 would likely overpower the room. McIntosh MC402 power amp will drive them. Thanks.