I'm not a huge Epson fan, primarily for substrate versatility, but they're know for exceptional color and image quality. Polypropylene, if not specced for your device, will print with the illusion of poor resolution. In reality it's the ink, every so finely beading, on the print surface. Same happens when you print a solvent based substrate on an aqueous device.
If you're looking for inexpensive, Canon makes a fine line of small laser devices that handle digital approved synthetics remarkable well.
Canon has put considerable effort into lowering their ruder temperatures considerably. Only downsize is letterhead printing, and any heat based binding method.
Canon has remarkable color as well - I've been using their production equipment for many years, and a fair amount of the technology has trickled down a bit into the lower end devices.
Yes the hardware is often more than inkjet, and the toner cartridges cost a bit more as well, but you'll find the yield to be profound vs inkjet. Plus, no worry of clogging printheads, and not being able to running coated media effectively.
