Back On the Topic of Driving 3.6's

I know that this one has been kicked around a bit too much, but given these choices (and ignoring cost for now) which is the best overall candidate for driving a pair of Magnepan 3.6's in a large room? Current PreAmp is a Hovland HP-100 (all tube line & phono).

Cary 500MB

Pass Labs XA100.5

Pass Labs XA60.5

Pass Labs X350.5

thx