What game system should I buy to play on guitar hero?

I am planning to buy Guitar Hero because it's fun and I want to use it my birthday party … anyway, I do not have a game system and Guitar Hero can not play without one .. so I'm wondering what should I buy? I do not have much money, so it can not be too expensive … but still wants to be a good game system and all. Also, a store that sells the game system the cheapest price?

The cheapest is the PS2. The 360, PS3 and Wii can connect to the Internet for Guitar Hero downloadable content and online battles / Co op game. The Wii uses a Wii Remote for each instrument in the World Tour, that is, how many players he wanted in a match, you should have that many officers Wii. The 360 versions have more DLC, but Xbox Live (it's online service) is not free. The PS3 versions are like the 360, just a lot more expensive, but with free online (to my knowledge)

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