What paper should I use with my digital copier?

In order to know the capabilities of a digital press, you have to know what paper, or substrates, it will accept. Depending on the needs of your shop, it very likely could be the difference in choosing a Xerox DocuColor 2060 over a Konica Minolta CPP500.

Just like everything else these days, there is a website that will answer all your questions. Visit PaperSpecs.com, a membership-based website that details what paper can be paired with what high-volume copier.

These folks are straightforward, not recommending paper per se, but instead what would be a good fit.
Once you've got your paper situation figured out, please consider JJ Bender for your equipment.