Interesting article about the ability and subsequent value of 1B scooping at FanGraphs by Michael Lichtman from a couple days ago. He acknowledges the flaws of the methodology, but explains in pretty good detail the gist of the analysis.
Crux: scooping is probably a quarter of a firstbaseman's defensive value while fielding grounders provides the majority of worth.
Leaders: Berkman and Choi at 4 runs per 1000 throws , while Thome is at the bottom with -2.5 runs per 1000 throws.

I mention this because I was one of those guys who rationaled away not getting Delgado the first time around in favor of Mein-whats-his-name for all "the errors he would save." As usual, joke's on me.