I have been wondering the same thing myself. I have been testing various papers over the last few months trying to find which papers I can print using my inkjet. Here is some of the paper I have tested
Sappi McCoy Silk 130lb Cover,
Sappi Opus Dull Cover 120lb
Sappi Opus Dull Text 100lb
Sappi Opus Gloss Cover 120lb
These have been printed on 12 x 18 in sheets, and so far the quality has been hit or miss. I think that if I was using a RIP that could regulate the amount of ink sprayed it would work great. The Opus cover prints nice using the ICC profie for Epson premium presentation paper. But I am still working on testing all the different profiles etc, to see what works best. The McCoy Silk is pretty decent in terms of print quality also, depending on the amount of ink needed for the image, it can come out saturated. But I have printed many of business cards usings letter size sheets of McCoy Silk and they have come out great (double sided prints also).
I like to print on double sided media all the time. Finding an inkjet paper from epson, hp, etc. that has great whiteness and texture qualities and be printed on both sides is tough. I have tried most papers, so that is why i started testing commercial sheet fed papers on the inkjet. I have also found that using those same papers print very well on cheap HP printers from Office Depot using the stock profiles. The dye based ink on HPs seem to meld better to the paper.