I would like to start this post with a request. The same request we make a lot around here. Especially those of us who have been termed "grammar Nazi" and the like.
Please take an English Composition course.
Now, to answer your question.
Inexpensive radios work fine. Generally nothing fancy, but for airsoft, they are more than enough to at least get you started.
I know plenty of people that run $10 radios from walmart, radioshack, etc. I like the slightly more expensive ones (motorola and the like) because they don't break as easy, deal with rain/sweat/tears better and stuff like that. Plus, they have better battery life and usually a few of the bells/whistles that people love.