Hacker News Reader

I can recommend Zero-K (http://zero-k.info/) and NOTA (http://nota.machys.net/) as very polished AAA RTS games based on SpringRTS.

As is always the case for games the available screenshots/media don't reflect the actual gameplay. I suggest you give it a try :)

There is also MegaGlest, which is under active development and already pretty good. One cool feature that I don't see elsewhere is the fully 3D positionable camera.

Thanks! I looooved Total Annihilation, I'd love to play some more!