why not look at vestax 275, 3 channel mixer with a fourth line so u can either add an effects box or have another deck on board, so u could have 4 decks eventually attached, how cool is that, and prolly for the same price or near to the ones u stated. Hope this helps.

If you have to choose from those 3, I would say go with the Pioneer since Pioneer is obviously better than the other two choices and it rocks!! Also, you have to consider what type of dj-ing your going to be doing. If its private parties, you might need a four channel to accomodate the mics, turns, cd players and wtever else. If you just messing around with dj-ing, I would say pay a little more and invest in a Vestax.

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I was born with headphones on

I will eventually invest in a better mixer, but for now when I'm just starting I don't really see any need to have more than 2 channels. I was thinking about getting the djm 300 anyways, just because it was the most known/popular mixer on there and I've heard good things about it. Thanks for your input guys, if you have any more suggestions don't be shy.