Dune 2000, it still rocks. Played it on PS, and then on PC.
And, I say, that Rome TW actualy is good. If you like sci-fi RTS like RTW, try SW Empire at war Force of Corruption, and play galactic conquest for rebelion on high diff.
If you want to try something greater, modification for SW FoC- Republic at war mod. Nr 4-5 on Moddb in last year. Link to Moddb
However, this mod can requer some performance of your PC...
