Reply to Mixer Question

Hello, I've recently re-acquired RGAS and want to build a CDJ setup. I found a decent mixer a guy wants to sell for pretty cheap but I wanted to check with you guys to see if it seems legit. So this guy wants to sell a Denon DN-X300 for 125 bucks. I looked up some reviews and it seems like a pretty decent mixer minus alittle cosmetic damage that I can care less about. But I was also looking DN-X1100 for 350, but as I will only be using two CDJ's I dont see where I would need 4 channels. Input appreciated guys!!