Get some Sup Com FA on that list and some UT2k4/UTC and you'll have yourself one hell of a list.
Planetary Annihilation?
These look good as well. Sup Com FA isn't too expensive either so I'll probably try that before PA I think.
Careful. The eco in sup com fa is confusing at first. A lot of people can't handle a supply / demand resource system. Personally, I think it's best (as in reality, you don't have an infinite amount of resource storage).