Well how can u guys forget the Command and Conquer Series !!!
Neways, buddy, ur system is gr8 for playing a good and gr8 REAL TIME STRATEGY Game wich satisfies all ur requirements (from ur 1st post) so have a look into these titles, wich I too own myself and im immensly pleased..
1.) Command & Conquer-Generals: It gives an accurate 3D environment in wich u are playing, U will be choosing from one of the 3 available countries (a.k.a FACTIONS, in CnC terms),
* the USA (a powerhouse of future weapons),
* CHINA (an euqally balanced side with huge beast like tanks)
* GLA (a terrorist group organisation wich uses Biological weapons like ANTHRAX and viruses as well as smuggled goods for their survival)...
2.) Command & Conquer-Zero Hour (an expansion of the above title)
3.) Command and Conquer 3-Tiberium Wars (the latest game, in the series where u can choose from 3 Teams (not Countries) (a.k.a FACTIONS like GDI, NOD and SCRIN)
NOTE: the CnC:Generals and Zero Hour are different from CnC3-Tiberium WArs in terms of Teams (a.k.a FACTIONS) and objectives where in CnC Gen and ZH (Zero Hour) u play for Country, while in CnC3, u play for capturing the Entire EArth and become a powerhouse (by collecting Tiberium)...
BUT, the gameplay and strategy is the same-- drag-select-point-attact kind of a strategy same as in every RTS (real time Strategy) game...
Rep me if u like my post..
Cheers n e-peace...