Fallout's not a bad choice. I used a female character for Fallout 1 (Got my ass kicked hard), Fallout 3, Fallout: New Vegas. For all of them, gender only changes two things: It changes some dialogue options + responses, and it changes several perks slightly (There's a perk that lets you deal extra damage to the opposing gender, I think New Vegas has a perk against the same gender, and I think both might have something that opens up unique dialogue with opposing sexed characters).
Most top-down RPG games you won't need to worry about as much either, since isometric views tend not to not give you much detail to see. Slight exception with Diablo 2 (which isn't on here), specifically the character select screen, but it doesn't do anything more than some.... to put it politely, bouncing, and your character rarely speaks anyway. Others might be a bit worse than others, though most of the time it's because of time period differences more than blatant sexism (Big majority of these games take place in alternate reality Medieval Europe), and only a select few go into talking about sex or "wenches" or whatever. From the screenshots, Sacred might be one of those to avoid anyway.
There is one game I suggest you try very, VERY soon if you haven't already. It's not an RPG, but it's still really good. It's called "Beyond Good and Evil", and for many people represents one of the best characterizations and writing of any female protagonist in a video game, and as a bonus no specific comments about gender or sex or anything. I've heard that Syberia is much the same way with it's protagonists, though I'd double check a bit on that.
Getting away from the RPG games a bit further, there's usually not a whole lot of characters to talk about as far as female characters. Evil Genius for example, there's a female antagonist you can play as. I think she has a larger area of influence which also has larger boosts than the other two characters, but none of them are written out at all to be of much mention..... Although, there's a female protagonist that will attack you every now and then. She shows up in a gold bikini and attacks everyone with knives when they aren't looking. So, that many get at you too.
Hopefully you'll find something.