Good network card?

[Daniel A.]

Hi,
I am currently having a big deal of issues with the ethernet cards on my 
server, as well as a possible motherboard problem.
This causes my server to reboot occasionally, but never in a predictable 
pattern. A while back, the reboots only occured once every two weeks - 
But now they're almost every other hour. I cant take it anymore.

So, do you know if the "watchdog timeout"s caused by bad network cards 
can cause a complete system crash/lockup/reboot? If yes, shouldn't a 
kernel core be dumped? And if no kernel is dumped, does it mean that the 
issue is potentially with my IDE controller or harddrive? I noticed 
that, at a point where I had no internet connection (And hence, my 
server was not used - but still turned on), the server stayed up for 20 
days straight without any issues at all - So my #1 suspicion right now 
is my network cards.

sis0 (onboard ethernet, 100mbit) and rl0 (PCI card) in my server right 
now are constantly having issues with their watchdog timeouts.

Considering that I am quite poor - What PCI ethernet cards should I buy 
for my server? And could you suggest a cheap motherboard which isn't bad 
too?

In advance, thanks a lot.