Seriously? The fans are just now moving on with their lives? And some people are still refusing to accept that the show isn't coming back? That's incredibly sad.
If you really, absolutely must have more space western, allow me to recommend Trigun, Cowboy Bebop, and Outlaw Star, the three shows that Whedon more or less admitted to ripping off when he made it. That's like three more seasons of Firefly! And if the fact that they're anime bothers you, you're not just a sad nerd, you're a sad, nerdy, hypocrite.