Condenser microphones need power to operate, and most of them are not able to run on batteries, so their phantom powered. Don't worry about your dynamic mikes, by the way. Phantom power does not harm them. Another way to go is a small digital mixer, like the Yamaha 01V or the small Roland ones. If you want a digital mixer then you should get a digital only soundcard and use the mixer's converters.
Digital mixers have the advantage of being portable and having hardware faders to mix with.
Mixing with a mouse on a PC screen can be tedious, I know. Maybe you should think of a midi faderbox to control your software with, if you don't need portability. Whereas you have to worry about saving your digital mixer's settings in some way together with the song. You can worry about big hardware mixers if you want to do live sound reinforcement or bigger studio work. But even then your PC is not obsolete - you can still use it for editing, doing multitrack work etc.