If you want to buy something like the RPi that can be used for more stuff, consider the BeagleBone Black and the CuBox Hummingboard. They have stupendously higher specs, but aren't much more expensive.
EDIT: If you plan on using it for just web browsing (and nothing else at the same time), just get an RPi and overclock it to 1GHz using raspi-config. Otherwise, I would strongly advise that you either a) get a Hummingboard or a BeagleBone Black, or b) buy a used Thinkpad on eBay and throw Linux on it.