Let me introduce you to Tiberian Sun: Tech Level War. It's a mod with a new gameplay tweak, in which you have to build very expensive buildings - the tech centers - in order to level up and have superior buildings and structures and eventually win the battle. However, there are not useless units in the lower tiers.
This is the Beta 0.3 version of my mod. Hope you like it! Any comments, suggestions, bashing, etc. are very welcomed and please put them at the main page, to help me improve the mod.