XMS memory is high performance ie overclocking so I think it's a waste of money for this application. A GB of regular Corsair can be had for around $80.
Make sure the CPU is 90nm and not 130nm. The 130's are older, run hotter and are power hungry buggers.
Heat and power consumption are the two biggies you have to worry about in these mini's.

99 Contour Sport SE MTX KKM filter, B&M shifter No res, BAT kit Green car silver hood (because silver is faster)