I would highly recommend looking for something tubed over SS. Not that you couldn't find a nice SS to mate with it, just that these amps work quite well with tubes.
You could also look into passive pre's, since the McCormack's are designed to work well with them also. But there's tradeoff's there as well, mostly being a certain lack of dynamics that a good active linestage brings to the table. One other drawback to a passive is the absolutely amazing transparency. Once you hear this you will be hard pressed to find an active pre that can match it (that is, if you still want that extra dynamic).
Enjoy,
Bob
You could also look into passive pre's, since the McCormack's are designed to work well with them also. But there's tradeoff's there as well, mostly being a certain lack of dynamics that a good active linestage brings to the table. One other drawback to a passive is the absolutely amazing transparency. Once you hear this you will be hard pressed to find an active pre that can match it (that is, if you still want that extra dynamic).
Enjoy,
Bob