They make good memory, and that's probably some of the best latencies you'll find in a 1GB stick (for whatever reason you can't go 2x512MB). Their 2-2-2-5 XBL modules are also really good overclockers, and are great paired with a P4 that you plan to overclock (on the A64 and often AXP, you don't need anything more than value RAM).
Brent: Your article's mostly irrelevant; that talks about DDR2 (for what that's worth; nobody's interested right now).