since I got my new computer and now Steam accept Reais,I want to buy some games there,so Steam users which games do you play do you recommend me(F2P or not)and cost around R$80,00(1 Real=2 Dollars)

Specs:CPU:Intel Core I3 2350 mhz
Video:1 GB(don't know if it is NVidia or Intel)
Ram:4GB
HD:500 GB

Any genre preferences?

Portal 1 and 2 are legitimately great games; Portal 2 is on sale now, and I expect Portal 1 will be come Christmas. Or, it's only $10, so you could just buy it.

? Games for up to $160? That is a lot :)

What kind of games do you prefer? Dungeon Defenders is quite funny :)

any genre for me.

Why must it be from Steam? Why not GOG? Or GG? Or another shop?

It must burn but I'd seriously suggest waiting 10 more days. The Winter sale should start Dec 20th.

Nothing wrong with picking up suggestions of course. Orcs Must Die 1/2 comes to mind personally.

other way around actually ;)

1 USD = 2.08060 BRL
1 BRL = 0.480630 USD

You mean the other way around, right? 1 Dollar = 2 Reais, so about $40?

Yikes, ninja'd already. :)

Did you get the Humble THQ Bundle? It's got a diverse set of good games for an excellent price. Other than that, on Steam I personally enjoy Deus Ex: Human Revolution and RAGE. There's also Dark Souls, Spec Ops: The Line, and Terraria. But for these games, I'd wait till the holiday sales.

Blacklight Retribution is a great F2P FPS. I had to uninstall it since I was playing it way too much.

Personally I enjoyed the story and its themes, there's usually a good variety of ways to approach a situation, there's a lot to explore and interact with, and you have a good degree of freedom in moving around the environments, particularly after getting the right implants. The game doesn't hand-hold much and you're required to use your own intuition to figure out how to resolve most problems. You're equipped to play as a totally stealthy character or as a guns-blazing warrior. There's a good selection of skills and weapons and the combat feels right. The boss fights are one of the weaker parts of the game, but if you're properly prepared you shouldn't have much trouble with them.

I would suggest to wait for the Christmas sale, too.

My opinion - it is great. I am a huge fan of the original. I was skeptical about HR at first, but I ended up loving it. The cover system works great for both stealth and combat. Takedowns are very satisfying. The biggest reason I loved DX is still present - the freedom to accomplish objectives however you choose.
There are a few things to nitpick at, like boss fights that just don't really fit in to the DX style of gameplay, but stuff like this is small, and doesn't prevent the game from kicking ass.
Personally, it is one of my 5 favorite games ever, right behind the original.
The Missing Link DLC is pretty good, too. But regular price for it is a bit steep. I'd wait for the DLC to go on sale before buying it.

edit - apparently the Steam sale starts in like 10 days. I'd definitely suggest waiting for that. You will probably find the game for 75% off during the sale.

This. And go for the dailies till then.