Dear Pek,
I essentially don't know much about "Mixer" but I happened to use one myself too. So after few days of hesitation I jumped in right now just to offer my own idea about it;
I also attached the pic of what I'm using that I'm certainly not advice you to buy because it only has 8 channel. It suits me well though because I'm only a "One man band" type. Besides it's cheaper and quite few people said Behringer is not as good or reliable as Mackie, but considering the price and what I need from it. I use one channel for my mic and the other for my guitar and occasionally use another channel for drum machine (in stead of plug directly into my PA/Amp) that you can also see in the picture, and I still have 1 more channel left for the extra mic and 1 more left for guitar if I need it. And I've been using it for at least few years now so the reliability is still there.
If I were you I'd go with Pood's recommendation without much thought. Pood always right about this kind of matter so I don't think you will go wrong.