Hi Kenny,
I have the Sasha's and Maxx 3's at home with Evo 600's and Ayre mx-r's. The ayre are used with Sasha (because of size constraints), but I have done some in-home a/b tests and I prefer the Ayre amps. I actually agree very much with what was written in the stereophile mx-r review comparing them to the Krells. The 600's do have a bit better bass/ grunt but the Ayre's are so musical and make bad recordings sound much better. The Ayre's are less fatiguing as well- I could listen to them all day long. CAST narrows the gap somewhat but you have excellent interconnects and lack a CAST preamp so that doesnt't come into play for you. If you have any questions let me know. I recommend trying the Ayre's. I have not heard the 600e's and am hesitant to upgrade.
I have the Sasha's and Maxx 3's at home with Evo 600's and Ayre mx-r's. The ayre are used with Sasha (because of size constraints), but I have done some in-home a/b tests and I prefer the Ayre amps. I actually agree very much with what was written in the stereophile mx-r review comparing them to the Krells. The 600's do have a bit better bass/ grunt but the Ayre's are so musical and make bad recordings sound much better. The Ayre's are less fatiguing as well- I could listen to them all day long. CAST narrows the gap somewhat but you have excellent interconnects and lack a CAST preamp so that doesnt't come into play for you. If you have any questions let me know. I recommend trying the Ayre's. I have not heard the 600e's and am hesitant to upgrade.