If your a novice to mixing, try a Numark Mixtrack Pro 2,
[video]http://www.numark.com/product/mixtrack-pro-ii[/video]
good quality for a low price, you'll be able to sell it on, no probs, if your ready to step up a level the high end pioneers with Serato are incredibly versatile.
[video]http://pioneerdj.com/english/index.html[/video]