Good quality Tofu is determined by its texture and the flavor of soy bean which should be just right.
Among those that are easiliy available at grocery stores, Trader Joe's is best considering its price (I think it's $1.29~1.49) and the fact that it's organic. Thank you TJ.
Japanese major brand "House" is probably the most widely available Tofu in the US, but I am not a big fan of it. It is either too soft (silken) or too firm (firm), and it's waterly and flavorless.
Another option is Korean grocery stores. Korean brand Tofus are not bad at all, and best of all, you might find locally produced (possibly hand-made), fresh Tofu.