I got my R3000 last year and love it. I have an ancient Epson R280, but the R3000 is seriously different. So far I've mostly used Moab Entrada paper in mine, and love the results for B&W photography. I've also had great results with Epson Glossy Paper for B&W.
A few comments. I'm on a Mac, so on the PC side things might be different but I've found that I can't print to fine art paper from Adobe Lightroom 3.x (I can from Photoshop CS5). I've also found that I get far more accurate results printing from Capture One Pro. Make sure you have profiles installed for each type of paper you use. It is worth investing in a sample pack from any of the vendors whose paper you might be interested in.
I recently purchased some Epson 13x19 Premium Glossy Photo Paper, and need to get my act together and make some colour prints. In fact I just realized that realistically I need at least one or two done today....
