A lot of folks are going to hate me for saying this, but don't use a condenser mic for vocalists. Condensers are good for recording concerts. They're also pretty deccent for recording things like pianos (oddly enough). However, in general, they're best for being a good distance away from a fairly loud subject. They are, in particular, not designed for close micing.
The worst thing you can use a condenser mic for is a solo vocalist. Condenser mic elements output a much lower level than dynamic elements, and thus contain a built-in pre-preamp circuit in the mic itself. That's why they require power. The problem is that those in-mic amp circuits have a degree of "self-noise". The amount varies from mic to mic. That self-noise is masked by complex or loud audio signals like a saxophone, a piano, a rhythm section, a choir, etc., but with a solo vocalist, it tends to overwhelm the signal that you're trying to record.
Condenser mics also tend to have a very flat response, which is usually not what you want for a vocalist. Of course, you can compensate for that a lot with proper equalization (get a good parametric EQ plug-in if you don't have one already), but it's a lot easier to have a mic that's actually designed for recording vocals rather than trying to "fix it in post".
If you have a lot of money, you might find ribbon mics nice, but I haven't ever had enough money to try one, so I can't give an opinion there.
Anyway, my advice is to find yourself a decent dynamic mic. If you're going for low-cost, I'd recomment
a Shure PG58 or even
a 565SD (eBay). Other folks will have different opinions, I'm "Shure", but in any case, definitely get something dynamic. With any half-way decent dynamic mic, you should be able to EQ it and make it sound solid.
Just my $0.02.