the phantom ones are usually the condenser mics, so far i think they're really the best when it comes to quality, but not recommended for live performances since the pick up is too sensitive (thats where dynamic mics come in). but if its for studio use or recording, get the phantom powered ones. you dont really need a USB mic, what u want is a USB or Firewire audio converter (which is basically like a USB soundcard with the RF in and outs), coz thats where you'll plug your mixer, and in the mixer you plug anything -- mic, guitar, keyboard etc. some mixer consoles now have direct USB out so no need for the soundcard.
im a Behringer fan so here's the best deal i got for good quality and price:
UCA202 Audio Interface RF input and output, fiber optic output, headphones output, volume control. USB
around $30
XENYX802 2 Channel mixer console8-input, 2-bus, Phantom 48V
around $60
C1 Condenser microphonewith mic stand head and carrying case
around $40
...so thats like $130 bucks for pro quality recording ^_^
so compare whatever you're planning to buy to this deal i just showed you, so far its the best i could find. just google them for the details and where to get it, one thing's for sure, its way cheaper there compared to the prices here (maybe coz you're close to Germany ^^) anyway i hope that helped.
hahaha in 0:52 is sounds like "so many passwords in my head" its actually "so many things were in my head" ^_^ XD 
