You have any luck finding drivers for it? Friend of mine just started runing XP64, but he can't use a lot fo his hardware - like his wireless card.
Unless i missed something he never mentioed running windows xp 64bit version....and if he cant find drivers tell him to get ahold of me its easy enough.
On to the ram: The maker isnt THAT bad for most hardware, but they build really shotty, low end quality ram. You could have gone with Infineon ram for the same speed, if not a little higher, around the same price. Its not a well known or even advertised fact, but Infineon is manufactured by kingston and comes with a pretty good warranty (lifetime).
The system will run well, i would just suggest upgrading the ram somewhere down the line before making any other higher end upgrades, its going to be a bottleneck otherwise : )