I need to get a game controller for my PC but I have no idea what kind I should get.
If anyone has experience in what kind is best, I'd appreciate some help.

I've got a Cyborg Rumble Pad

Works pretty well for me.

They're sold by gameshark now.

Cyborg Rumble Pad is 35$ USD

Although I don't have a Game Controller

My mouse & headset for Ventrilo are Logitec.... They make some fairly good products that are decently priced

Logitech is very good and if u love to play sim-racing games - Logitech G25 or better model of "G-series" is nice
but if u love to play only in FPP/FPS game - true palyers use only WSAD + mouse

Personally, I sync my Playstation 3 controller via Motioninjoy. You can also sync is with bluetooth if you have a compatible adapter.

I use the Logitech Cordless Rumblepad 2 and it works perfectly. It is wireless and the batteries last really long.

A wireless or wired ps3 or xbox 360 controller works wonders on the PC.
You'll need to buy a receiver for the wireless controllers and download free software for them.