Everyone that prints enough of their own photos these days will eventually discover Red River Paper.
I'm responsible for the care & feeding of an Epson 4900 and I'm not at all shy about spending money on quality supplies. I print a lot and these guys offer top-notch quality and the best customer service in the business. Period.
+1 on Red River - I always found it to be an excellent match for my Epson printers. I ditched the photo printer for many years (waiting for color profiling to catch up) but bit on the Pixma Pro 100 deal as well a year or so ago for my personal printing.
The best paper I've found for the Pixma is the Canon Pro Platinum paper. I'm more of a matte paper guy, but I have to say that the Pro Platinum produces some amazing glossy prints and comes close to the metallic prints in terms of depth & color saturation. Keep an eye on Canon USA's store for deals - last year I purchased several packs of the Pro Platinum 8x10 paper in a buy one, get four free deal with free shipping and extra paper (4x6 packs) for spending over $50. I spent $67 and got nearly $600 in free paper. Really. I have enough paper to last me many, many years now!
Now if they'd just do the same thing with the ink, I'd be all set, but I think there's some kind of conspiracy going on here