@baskerville: Yep,
DU.
You can also play with
GC4, but it's been used much less often (as in, almost never, actually

). OTOH, I can't remember what makes GC4 so quirky. It's probably slower than DU? Might be as simple as that

.
So, yeah, DU

. It's actually what replaces A2 on REAGL-devices in Kindle-land. (Well, there still is an A2, but it interacts really badly with REAGL, unlike DU).
It (DU) should handle icons with alpha-blending related AA properly, for instance.