I've got an R300, and have had it for quite a while. Print quality is top notch on everything from plain paper to matte to glossy. It prints great to it all.
At the time I bought it, I was also an HP fan, but the stuff of theirs that matched up to the print quality of the R300 was upwards of $400 at the time, so I got my first Epson, the R300.
You can get genuine ink at a good price from Amazon usually, and sometimes Buy.com is even better.
I'd highly recommend it. The only thing you'll need to remember is that like once a year, or maybe even every 6 months, you'll just have to clean the print-head, since those aren't replaced every time you get new ink, like it is on HP printers.