Hostile Territories http://www.hostile-territories.com/
Hostile Territories is a massively multiplayer browser based space strategy game. The aim of the game is simply to build up a spacefaring empire and have fun. There are 63 different types of military unit in the game. That's 7 types of planetary defence, 7 generic ships that every race has access to, and then 7 'race specific' ships for each of the 7 races. While it is not possible to build another races ships... you can capture them in combat, so it is quite possible to have a fleet with every single ship type. In Hostile Territories, military prowess is rewarded as well as size.