Total Annihilation Total Annihilation Total Annihilation would have to be must buy.
Units are also available for download there along with maps.
Total Annihilation, as you can tell from the screen shot is very 3D and has a great story line. The campaigns are very simple to beat and you can even make them harder. Multiplayer is the best though of all options. 6 people can join one game and duke it out with all out war including an ever growing arsenal of nukes, becareful of metal and energy shortage though, but the concept of the game is awesome and I would most definately recomend it to anyone who asks.