cura on 23 March 2011
maybe wait for AOE online which should come out later in the year.
However, you really need to mention whether you will be playing online or not...most RTS games (or the ones I've played) are a completely different beast when playing online versus just doing the single player campaign. Also, some RTS games simply do not have an active online community so if you are going play online then I'd choose carefully.
