Just realize that Red Orchestra is... different, from the usual FPS. It requires a completely different set of tactics and you have to expect to be either prone for most of a match or behind a wall.
I'd recommend Battlefield 2 - it's six years old now so it should run fine on any computers these days and is simply brilliance, even better with a few mods like Forgotten Hope 2 or Project Reality to spice up the gameplay. The Complete Package should be around $20 on Steam now. (Though don't pay more for the Complete Package, as all those expansions have been released for free on the internet!)
Edit: In response to above post... it's not for 'super hardcore' but it takes some getting used to when travelling over from Bad Company. Once you learn how to not die in the first minute of the game the intensity is something unrivalled in most other games.
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