Definitely the Mushkin Level 1, it'll give you more headroom. BTW if your looking for good prices on the Mushkin Level one, get it at monarchcomputers, they have a 1GB kit for $259 compared to over $290 at most places.🙂 BTW with the new Nf3 250GB boards showing up, most A64 3000 should be able to do 220x10 easily with some decent PC3500 ram.