For those on the other side of the pond A3 is approximately 11"x17", right? If so you are probably going to have to go to a Super B (13"x19") printer. I am not aware of any printers that are sized for A3 at least in the inkjet world, but there could well be some.
It would be a bit easier to suggest a printer if you can tell us more about how/what you want to print. More specifically are you looking more for glossy or for matte/fine art prints. Is black and white important to you? How important is the archivalness (word?) of the prints to you? Approximate maximum amount you are willing to spend?
I recently purchased an R2400 and so far I am extremely happy with it. I don't know what the Canon equivalent is, but there are Canon printer users around here so perhaps one of them could fill you in.
The prints on matte/fine art papers (I use Moab Entrada papers a lot) looks a bit better than the 2200 which I was already very satisfied with. Prints on Espon Premium Glossy look much improved over the 2200 which I found to be almost totally unusabel, but still not quite what I would like in a glossy; adequate, but just barely. The B&W prints look really good; much, much better than anything I was able to achieve with the 2200.
Strangely enough I just came from the bookstore and I was looking at Digital Camera World which is published in the U.K., and they did a review of 6 13" printers and referred to them as A3 printers. It didn't have the Epson R2400, but it did give high marks to the HP 8750.
