I have a standard Cambridge Audio A5. Nice cheap bit of kit that has served me well. I was wondering, is the new range of CA gear worth upgrading to? Namely the Azure 640a - will I hear much of an improvement over the old A5? If its not, what kind of amp could I get at the moment that would qualify as the 'next step up' on the ladder? I need pre-outs for a power amp, and a headphone socket. Thanks!