Kef vs Martin Logan

I know these are two completely different speakers, but I've fallen for both of them and I would like someone else's opinion. First I am comparing the ML SL3's to the Kef Reference Model 3's. I have a Sunfire Theater/Cinema Grand setup. Will the ESL's work well with the Amp I have? Also space/ placement is a concern. My room is medium sized (15x 12 w/ 10 ft cielings). I'm not trying to shake the building but I don't want to think I'll be wasting my money if the speakers are restricted by acoustics. Any input anyone has would be welcome.