Since I'm about to beginn a job as a graphic designer, I wanted to know if any of you guys could give me some advice regarding graphic tablets :). I'm planing to spend up to 80 bucks for one.

Your budget doesn't exactly give you much room to move from what I can work out. In terms of tablets I would generally only recommend wacom for compatibility and build quality. An entry level Grapphire4 4x5 has a RRP of US$99.95. Given your price constraint you may wish to opt for a refurbished model or perhaps eBay.

If you are serious about graphic design, it will pay off to save for a better tablet such as one of the Wacom Intuos tablets. You may be able to get away with a 4x5 Graphire if you don't plan to do too much drawing or intensive graphics work. They are avaliable on Newegg for $85. However, if you consider making anime wallpapers "graphic design", you'll be fine with the Graphire 4x5.

I use a Wacom Graphire 6x8 tablet and it works fine for me as I don't do too much drawing.

Thanks to you two for the advice ;).
After reading a few reviews, the GRAPHIRE4 CLASSIC A6 has to be it and it only costs 73$ for me :).