xen advice

[Carl Brewer <carl%bl.echidna.id.au@localhost>]

I'm about to replace an oldish i386 (NetBSD 3.1) box with a celeron 2.8 
with a current generation core2duo (8200 I think) and a couple of SATA 
500GB HDD's that I'll run as s/w RAID1 (raidframe).  It's going to be 
running NetBSD 4.0, the aim being to be a general purpose server 
(apache, zope/plone, sendmail/cyrus/clamav/spamassassin) and hopefully I 
want to retire a development box running CentOS5 and run it in a VM of 
some form.  I'd like to use Xen as I think both NetBSD and CentOS will 
run happily with Xen and I'm pretty sure that VMware doesn't work too 
well as a host OS on NetBSD.

I'd like to run the NetBSD box as the xen dom-something (what's the 
right term for the host?) and one or more CentOS 5 installs in DomU's 
(right terminology for the hosted VM's?).

Is that a good configuration and likely to be stable?  If so, what 
kernel will work best on the NetBSD host in terms of the best use of the 
multi-core CPU?

Thanks!

Carl