Best Bass Amp Strategy for Zu Def Pro

Hi folks. I've gotten alot of really helpful advice on this from Phil Ressler, and I'd like to open this to the insight of other Zu folk. I've never given bass amplification any thought until the Def Pro's. The amps for the front drivers are audiopax 88's. I'm leaning toward Mcintosh MC252 for the bass array as per talking to Phil, and a buddy has their 400/ch running his Piega's so although I'm not a big SS fan, they do seem to be tonally rich and musical. I don't want a cyborg bass sound but I do want the bass to have both lots of grunt and be as musical as the audiopax.

Thanks in advance for the feedback.