Thanks for your advice. I just placed the order now, so will hopefully have new components to play with by the end of the week.

Thought I'd better add another case fan too (a 120mm Zalman), as better CPU cooling for a socket A processor seems hard to come by (not too surprising since it's obsolete) and I don't want the system to run too much hotter than it is already (42-44C on idle, with the core hitting 60C after running SP2004 for a while). At the moment the processor's only o/c to 2800+ so there should be a reasonable amount of headroom.