James,
I have a server running 5.5 with P4-1.8G on Intel 845G Chip set, I am using the software Raid 1 with 2 80G HD (Both as Master each on one IDE Channel, 1 CD Rom set as 2nd slave).
At first I can not use the Intel on board LAN, but with the advice from some helpful guy here, I have use the Intel e100 from Mary and get the machine running real fast and smooth.
I guess you must try to set the HD like me before getting into any additional Card, as I believe "simple is beauty". Adding too many additional card will only make you busy beduging.
I would rather put that capital to buy more RAM, that will make you applications to run faster, by not getting on to the swap drive.
Best Regards,
Paul T.C.Fung