AM2, why? DDR2. High latencies? Well, it does opterate at almost 1Ghz. And with some high end RAM, you can have 4-4-4-12 latencies @ 1Ghz which are pretty damn good for DDR2. And for those extreme enthusiasts, 4-2-2-1 is also possible with DDR2.
Future compatability. But if i was really going to get a new computer, i would go with an conroe. Just blows Intel out of the water. hehe. Almost 9 sec super pi.