Love the party story man I am a DJ at college right now to which is cool, plus we got basically the same setup.
If you absolutely love the Serato Intro and that is all you are used to then your route would be to look online for recording software that allows you to still use the mixtracks sound card, otherwise it would be advised to use a program like VDJ or Traktor to record yours songs.
I love VDJ for a lot of things but recording is the best, uses the right sound card and records directly into WAV so it sounds crisp, plus your NMP alll ready has a solid TSI for VDJ so your plug and play baby