Which Platform?

["Freidank, Kenneth" <Kenneth.Freidank%delta.com@localhost>]

I'm facing a delima.  I want to put Xen on as a production level server
with individual domains serving the user community.  I can't figure out
from all the posts, which NetBSD and pkgsrc xen tools versions would
best serve my intentions.  

Anyone have recommendations on the best (most stable) platform to use
for dom0?
NetBSD 3.1?  pkgsrc-2006Q2?
NetBSD current?

Can a higher version of NetBSD run as domU than run as dom0?  Are there
problems mixing and matching pkgsrc versions with the NetBSD versions?

Thanks for your feedback.