What kind of WiFi card should I get?

[SuperJeRoT]

So, I'm kind of a noob when it comes to networking and I gues this is a good place to ask.

I have wifi router and want to conect my computer wirelesly to internet.
My computer is not that good- athlon 64 x2 5600+ @2.9ghz ; 2 gigs of ram etc.
The internet speed is 160 kilobytes when downloading and maybe 20 up.

So not that fast either... :(

 

I heard that it is posible to get a small, usb flash size, wifi receiver but I am sceptical about it, and I want to spend as little as posible.

Should I get that or buy a internal network card and anthena?

Is it going to cause my (already not that fast) internet conection to run slower or it does not going to cause bottlenecks?

Does it get hot when using, and does it cause internet to stop working often or not at all?

[WALK3R]

Edimax EW-7811Un for a Small one, stops you from snapping it off, Edimax makes some decent consumer gear.

[SuperJeRoT]

Ok, I cant order online because of international shiping. So I found these that I can order online:

 

http://pcpractic.rs/proizvodi/wireless-kartica/34481-tp-link-beini-adapter-usb-tp-link-tl-wn722n150mbps-rp-sma-antena-4dbi

http://pcpractic.rs/proizvodi/wireless-kartica/22446-tenda-beini-adapter-usb-tenda-w311mi-do-150mbpsinterna-antena-3dbi

http://emmi.rs/wireless-antene-i-oprema-bezi%C4%8Dni-adapter-usb-asus-usb-n10-150mb-s-%28mini%29.11.html?productId=32327

 

what is the best one if there is any diference? I don't care for size because it is going in the back of my pc and staying there probably.

Oh and sorry for the links and serbian language, but yea... you guys will forgive me, your'e all awesome and helpful :)

[WALK3R]

If your getting one for a PC have a look at the PICe ones, but if I had to pick it would be this, http://emmi.rs/wireless-antene-i-oprema-bezi%C4%8Dni-adapter-usb-asus-usb-n10-150mb-s-%28mini%29.11.html?productId=32327