I'm thinking about buying the Rode NT1. Do I need a pre-amp with that mic?
Also in the specs it says Power requirement:48V D.C.
You need a mixer to feed the mic with 48v.
Remember that the Rode is a condenser microphone, so It's designed for vocals or cymbals (mid-high frequencies).
I'd suggest you to buy the always reliable Shure SM 58 or, if you have the right budget, the Shure Beta 58.
They're good enough for everything, plus don't need to be feeded with 48v (they're dynamic mics).
Anyway if you're a "recording freak" like me, I'd suggest to buy the Shure SM 57 for guitars (and percussive sounds) and the SM 58 for vocals.
Cheers