Aperture for now. I'm finding the speed issue to be getting to me, and given I'll never get a mac pro, and quite possibly would switch back to PC, I'm contemplating switching over to Lightroom.
What was it that turned you off to Lightroom? I don't really like the modular idea, but the developing tools I find to be far better than Aperture.
My primary goal is a DAM tool that is strong in editing, and I didn't like iview, heh.