Gaming

If you haven't played any FPS for a few years,
CoD Modern Warfare and Modern Warfare2 can be had at sale prices ($10 - $20).

Both are good, as far as I'm concerned,
and your knowledge of weapons and tactics will parallel the real world without a learning curve for Plasma Blasters or other Science Fiction weaponry.
I've heard they are good for MultiPlayer too,
but, living out in The Woods with a wife who doesn't like Shooters,
I haven't had the opportunity to try CoD in Multi-Player yet.

Modern Warfare 3 is still pricey at about $40 on Amazon.

The latest release, Black Ops 2 is $59,
and I haven't bought that one yet.

The Cod series offers a decent storyline and graphics,
but also Special Op challenges that can keep you engaged for hours & hours after finishing the storyline.
It is difficult to complete them all on the "expert" level playing solo.

I am an old gamer, play Solo, and began on a 386 playing Doom, DukeNuken, and Castle Wolfenstein in the very early 90s.

My Wife bought me an XBOX 360 last year, and I tried out Call of Duty,
and, after getting used to the controller, I like them just fine.

If you have been "out" for a while,
and have never played 1/2 Life or FEAR, you might have to give those try
just for the hell of it.
They are outdated by today's tech standards, but both are classics,
and much fun.... especially 1/2 Life.

I'm no expert, and my experience is limited,
but it sounds like you might be in the same place.

YMMV