I've been using precision calipers since 1984 or so. IMHO this is a place where you should spend a bit more. I agree with Mr. Holifield, but would add Brown & Sharp in 3rd place and all others as not worth the time or money. I use Mitutoyo's at home.
One caveat though, the Mitutoyo "MyCal" line of calipers are NOT the same as their std products and are barely above the consideration line. If you're wanting something better than what the reload tool mfg's offer, but can't quite swing one of the top 3's regular product then these *might* be worth considering.
Just because the digital's display .0001" does not mean that calipers can actually measure that precise. Consider that 4th digit to only indicate which direction to round off to .001" and nothing more. By using poor technique I can vary the numbers on the display of any of my digital calipers by .005" so how could I possibly think that they're accurate to .0001"?