For small runs (100–1,500), digital printing is the best option. For digital we use Colt Printing and Minuteman Press. At the time of this writing, Colt Printing has a Xerox Nuvera (which is great for low cost, exceptionally high-dpi, black and white printing) and a Xerox 1000i (a full color digital press which can handle up to 130lb digital-ready stocks). Minuteman Press has a Xerox Versant which is comparable to the Xerox 1000i. All three of the aforementioned presses are considered green digital presses. When printing digital, sub-par quality control is unfortunately quite common, so we’ve learned to specify “back-cuts on all edges” in order to ensure clean and crisp trimming.
For larger runs (1,500–50,000), offset printing is the best option. For offset printing we use D&K Printing who utilize a stochastic screening platemaker (which results in super high-definition printing) and low-VOC, 70% vegetable based inks (nearly the highest possible vegetable content). No matter which printer you choose, don’t forget to specify an eco paper, discussed here and here.