I'm going to try that rice flour soon, but for now I use corn meal. I know some people don't like it because they say it's a little 'gritty', but I grew up with that on the bottom of my pizzas and it never bothered me. Actually, I prefer that 'Crunch'!
And when we have pizza party's, I don't get any complaints about it! (and ALL of the pizzas get eaten!!)