GenderIsAnIllusion

For Fighters, Skullgirls, Street Fighter, Blazblue are good.

Strategy, anything made by Relic entertainment, Supreme Commander 1, and most of the Total War series

Puzzle, the Portal Games are a great choice and if you like Zelda styled puzzle adventures, the Darksider series is good as well.

There are so many games on steam that are awesome and totally worth getting, I guess a lot of it also depends if you can run some of them too ;p.

Heck, I have a bunch i've yet to really get around to playing, and a bunch on my wishlist I want.

One tip though, wait until a game is on sale for like 50% off before buying it, unless it's cheap, or you really really want to spend the money, because many games go on sale right after you buy them full price

or atleast that's been my experience a few times, and similar instances when I buy games on like 25% off deals, only to have them be even cheaper a bit later on.

But yeah, there's a lot of games on steam that are good....