A64's reportedly like low latency better. If you're not going to OC, then any name brand PC3200 (corsair is good) should work fine, with the lower latency's better.
Don't have any experience with A64 mobos, so the current 'party line' here (LOL) is a board with NForce3 250. Some say Asus is good, some don't like it. MSI somtthing NEO2 is repeated often as a good board here. So is Gigabyte and a couple other mfgs.
More important than the mobo for eq2 is the graphics card. I have an XP3200 (not A64) (well, 2600 oc'd to 3200 speeds) with an R9600XT and I'm running the beta without any lag/problems even in a raid fight. (I was MT, so I'd better not have lag...) I don't have all the eye candy turned on, but have it set to default values. If you're getting a 6800 or x800 GPU you should be good.