I have just bought the Canon Pro 300 and it's excellent. It's a 10 colour-pigment based A3 printer, with a chroma cartridge for gloss/lacquer. I'm really pleased with the overall quality. It's better than Lab quality in my case. The inks can obviously be bought separately, and they're about £14 each. You're never likely to run out of all the inks at once, so buying individual ones may be the way to go. You also get a FULL set of ink with the printer, which is great. How much do the tank refills work out on the Epson?
I've no experience with the Epson but I did a lot of research prior. The Canon came out top in most tests, maybe apart from paper handling. Surprisingly though not much is said about cost of ink, in any of the reviews. I guess it's dependent on what you do with it.
I do also own an Epson A4 6-colour dye based printer which I use for the smaller stuff. It's excellent value, and reasonably accurate considering its age, but the A3 Canon is in a different league.