What next opinions

[DjPeaceWave]

I needs some opinion in what equipment to invest into next. I have read many posts about this sort of thing already but I would still enjoy some opinions. I am a dj and am getting into dubstep production. I currently own
Ableton live
Good speakers
Cerwin Vega sub 18"
Crown amps and crossover
2 Decks
Now the problem is I recently got a new laptop(early gradation present) that has no fire wire. My old sound card was fire wire so I need a new sound card. My good friend also lent me his mixer and now needs it back. So the question is what should I get first what is more important. The equipment I would probably get is Traktor scratch duo 2. That would give me a good audio interface. If there is a better interface for the money please say. For the mixer I would probably go with Denon dn x-120. If there is any other gear you seem more important please say. Thanks

[futures_untold]

Some decent earplugs for playing out.

Money can't replace lost hearing at the end of the day....

[DjPeaceWave]

Most of my gigs aren't that loud. The only time I am around loud music is mainly at shows.