Building new AM2 system, advice needed

[Scott I. Remick]

So it's been a while, but I'm ready to build a replacement system for my 
desktop. It seems a lot has changed since I last built one, and the 
decisions (hardware support) are foggier than last time. I'm not so rich 
that I can afford to keep buying stuff and sending it back, so I could 
use some advice.

My criteria are:

AMD socket AM2 (going to use a 65W Athlon64 X2 Windsor, as Brisbane 
doesn't seem better)
DDR2 (800 preferred)
integrated video not necessary (need nVidia DVI card)
integrated sound fine if it works, even basic, but not necessary since 
cards are cheap.
NIC needs are basic (10/100), so support of integrated NIC is nice as 
it'll save me a slot, but not critical as cards are cheap

SATA2... I'm 99% positive I'll be wanting to do some RAID, at least a 
mirroring of my system/OS drive. So it'd be REALLY nice if FreeBSD 
supported whatever on-board RAID the MB had, since this will save me 
buying a 3Ware card (which are NOT cheap)

I have traditionally gone with Asus motherboards but I read they aim 
more for bleeding-edge gamers than the rock-solid stability I expect 
from my FreeBSD system. I can't help but wonder how many of my 
occasional FreeBSD lockups are a result of that...? I hear that Tyan is 
more-stable, however FreeBSD's support for Tyan boards that meet my 
needs is questionable/fuzzy. So I'm having a hard time.

Can anyone offer some advice? Even if not specific models, 
insight/thoughts/opinions are appreciated too. Once I get the MB picked 
out, everything else will fall into place. Thanks :)