R.U.S.E. is a tough, capable and hardcore RTS that's really rather good. The battlefield looks absolutely beautiful on high-end rigs, and a range of deception/counter-intelligence systems make it more nuanced than ever before. The campaigns are extremely hefty (with decent tutorials), though you'll have to sink a lot of time into it before getting to the really fun stuff. For some, that's value for money.
Why not check out Neil's full review?