Some of the comments I've seen hit it on the head: The Brand + Model + Revision of Motherboard you buy is key for ANY system (esp. a server).
Myself I don't like buying anything I haven't researched to death; I also
really want to hear what other people's experience has been with the stuff. (note: people I trust... not some script kiddie; though on
/. you can usually tell which are which)
Checking
Tom's Site and
Ars Techina to see what they think doesn't hurt either.
As far the Power-Always-On feature you want well, 3 things:
1) I would not recommend any soldering at all as your warranty will most likely go out the window. This can be a
very bad thing in a corporate environment.
2) Most high quality Motherboards come with either a CMOS or Jumper setting (or combo) which tells the PS what to do when power is applied.
3) A good case goes a long way... both in ensuring you have a quality PS, and that you won't slice your fingers when you need to work on it. (Can we have a poll on how many times we've done that?
:) ) You'll want to make sure the PS is compliant with ATX 2.01 to be on the safe side too.
As far as personal choices, I'm a big fan of both
Supermicro Motherboards and Cases - my personal fav is the SC-701a style case - it's a beauty! but unfortunately its soon to be discontinued...
:(
Anyway, just my $0.02 (which is worth even less as its Canadian...)