Thanks guys, lots of good points.  
My reasons to upgrade are many:  Both computers are often being used at the same time and daily one of the kids wants to use one while my wife and I are on.  The Win 98 machine gets a couple of hours of use a day.  It’s slow, locks up, sound stops working until reboot, lots of things won’t run on 98…  It’s pretty darn old for a daily PC and needs to be downgraded to the kids.  The “New” machine is an Athelon 1400 on an ECS K7AMA motherboard; it’s over 5 years old and was dogging when I stopped playing AH about a year ago.  I’d like something that could play AH and modern games and software.