Going with the 2123 for the first outing. I think it should do very well as the mid in this system.I'm already toying with the idea of doing a variant on the TAD 2252 monitor, which uses the 1102 and 2002. I would use the 2001 in a 12" x-flare Martinelli. But I'm trying to restrain myself until I've played with the ones already in the works!
Keep your ears and your mind open.