The white papers by Atma-sphere, who sometimes posts on the forum, can be found here. You want the third and the fourth.
"Watts" Versus "Current"
Can someone discuss, in layman's terms, the differences here? I've seen some high wattage amps that do not produce much peak current and some low wattage amps that produce a lot of current. Which stat is more important--watts or current--in terms of deciding on a match with speakers? If current is more significant why to we (and manufacturers) talk mostly in watts?