We ran a 160SP for a couple of years. As mentioned, a lot of ink goes in the waste, more than onto the media, as we printed maybe 1 hr /day. Used OEM inks. Probably at least 1/2 liter / month in waste. ($100). Not enough of a cost to justify going to bulk. Also make sure the date is reset in the machine to keep the ink cartridges working after the expire date. Then you may be able to buy expired inks cheap.
We now have had an Epson GS6000 for more than a year, and only last week emptied the waste can, 2 liters in more than a year is not bad at all!
Only time we had heads clog were last christmas when it was shut down for 3 weeks... Not a good idea, but it cleaned up fine with a few cleaning cycles.
Conclusion: Ink cost is higher on the JV3, but a very good printer if you don't need photo quality. Stick to oem ss2 inks, and ventilate the room. The fumes are harmful, but not as bad as Triangle inks. Probably the best value for money, it's solid and a very good printer. Go with whatever ink is currently in the printer.
OH- You will also need a laminator. Not maybe. NEED. All printed vinyl needs to be laminated. And then you will probably need a new cutter, with some kind of optical eye to cut contours on your prints. I recommend a Summa T with OPOS, find one used.