I would give serious consideration to the following:
Intel P4 2.4GHz / 800 bus overclocked to slightly above 3GHz.. This CPU has
hyperthreading enabled (appears as 2 CPU's to XP-Pro)
This is is easy overclock for this CPU on 865/875 motherboard (I have used
Abit boards).
Use ($$) RAM that will run 1:1 @ overclocked FSB speed (I have used Corsair
and Kingston). To save $$, use slightly slower RAM at 4/5 speed (set in
BIOS).
This will produce >16 WU/day.

DVD burner - Plextor, Pioneer, Sony, LiteOn
CPU cooler - I have had good performance w/Thermalright. For quiet, look at
Zalman and watercooling (I am usoing a Corsair water unit on 1 box with
success).
Sound - built into mobo
Video - Saphire ATI 9600 or above w/HeatPipe cooling (no fan)
LAN - built into mobo
Case - I am partial to Lian-Li 60/black, but there are many options here.

You might also consider a Shuttle XP SFF (Small Form Factor, aka "Shoebox")
system. I have SN75G with 865 chipset with heat-pipe video card, 200GB
7200RPM HDD, DVD burner that works fine.

I am an AMD fan, but with Hyperthreading, P4/800 is CPU of choice for SETI,
IMO.

========================
"Apostolos" <am59@ath.forthnet.gr> wrote in message
news:a49f73d0.0402181608.709a26c2@posting.google.com...

I would like to build a system for my office PC:

Money is not an issue if something is really worth it.  For example I
dont think it is worth the extra $300 to get the Athlon 64 3400 than
the AThlon 3200+.

The Pc will be for office use, however I would like it to be very good
at SETI@HOME.  (8500+ units and going......:))

CPU Athlon or Intel? AS stated above I dont want to spenfd the extra
$$$ If the percentage increase is small.  The cpu must be great at
seti above all since I wont be playing any games on it.  (and run
office but all modern pcs can do).  Toms hardware doesnt have any last
tests on seti.

Motherboard:  It has to be reliable but also support overcloaking.
For my home pc I have an ASUS motherboard p4c800 that overclocks my
pentium 3 g to 3.3 g.  iT IS PRETTY STABLE AND i AM SATISFIED.

Ram:  1 gig is a must!

Graphics card?  I guess any will do??  Office work mostly.  I have an
eizo monitor so a dvi input is an option if it makes the screen
better!

Sound card:  Simple, only to hear some videos

DVD writer???  Need a good one since it will there for a long time in
terms of speed.

HArd disk?  I was thinking to get the raptor sata 36 Gig for the
system and another for everything else..

Lan card:  A stable one?  Any ok one will do.

Fan:  I need a silent one, at home I have one zalman for cpu and one
for the power supply and it is quiet:)

ANy other ideas??

THZ!!!!!!!!!!