Something like an X1 or, if you can wait that long, one of the new Behringer controllers might be worth looking at, for control over effects and cue points.
id get that monitor off your macbook asap lol check this out http://twelvesouth.com/products/bookarc/ I think it would be a good first addition to your rig and will be a lot kinder on your mbp. At the very least drop it down onto the other shelf..
I think you could also look into getting a Kontrol X1, it will really open up traktor/digital dj’ing for you, assuming you have it, otherwise it will introduce you to traktor with the lite version it comes with. Thats all you should need for a while if your just starting. Spend the rest of your money on some tunes from beatport
Thanks for the suggestions! I will definitely look into a used X1. I realized today that I really dislike the looping and cueing on my MTP. Hopefully I can find a good deal