[Twinge]

'mfgs' is short for manufacturer's.

'opaque xfer paper' is opaque transfer paper, a type of transfer paper that works on darker shirts (regular transfer paper only works on the light colors). I personally would not recommend it, as from what I've seen the opaque paper is really poor quality (even what was supposed to be the best of it out there). Others have had better luck, though.

 

[Twinge]

Well, any pigmented ink should do fine. That includes Epson's OEM Durabrite and the 3rd party Magic Mix inks, and perhaps a few others. The washout problem only happens when you are using a dye-based ink, as you'll find in most other printers such as HP. As far as I've heard, the transfered image still looks fine, it just bleeds the first time you wash it... however, even though its fine in the end, I wouldn't consider that a very professional product.