Nausicaa of The Valley of the Wind Manga and have been blown away. It's good, and by the end reminded me of the Lord of the Rings in its scale and depth. If you've read anything here, you'll know that I don't throw that compliment around lightly.
Another property I love is Valkyria Chronicles. It was heavily influenced in its look by Nausicaa, and that's one of the reasons I love it so much. I don't usually buy art books or design books, but I couldn't pass up the technical manual for Valkyria Chronicles.
Why am I talking about these things? It's made me realize that I love the dirty, grimy trench-ridden setting of alternative World War I settings. The technology is still primitive, air force isn't so much of a factor, and cavalry still plays a role. Tanks are primitive but exist, and everything has a post-steampunk, traditional Victorian steampunk of course, feel to it.
We're missing out! I can't think of a single game setting that focuses on World War I level tech. Everything is either too primitive, putting it squarely in that steampunk camp, or too advanced putting it into World War II territory. I don't even need a game that is based on our own era of World War I. I'm just asking for something like the aesthetic.
Hell, just give me a Valkyria Chronicles RPG, and I'll call it a day. It already has classes all ready to go!