I have Rega Isis and Osiris on demo at home now and to me it is an excellent sounding system.More than enough power,huge sound-stage,non fatiguing with silky midrange.Guitars and vocals never sounded better.I have to mention that part of this great sound is ISIS which could be one of the best CD players around.The sound is liquid and very involving bordering on analog.I also have listened to Mcintosh 6600,it has many nice features, but it was a little underpowered and slower with less resolution, but still a nice sounding with good sound-stage.