Heroes & Dragons - but note that the RPG stuff is sort of hidden away in the center of the store just behind the front counter area - Last time I went in there, I thought they had gotten out of RPGs completely, because all I saw was the collectible memorabilia and the comic books! But they had a decent selection there, and if you have time to only stop at one, H&D is the best choice.
SIlver City USED to be a hot store for RPGs, but now they call themselves "Silver City Comics" and they may have gotten out of RPGs entirely. If you have a chance to stop by, when I used to go a few years back they had a wide selection of RPG material, plus quite a lot of older stuff that was hard to find, too.