Peter,
I can't add much to what Scott said. I have 4 things.
1.) A really good condenser mic with splatter shield, and
2. A clip on vocal booth for the mic stand that surrounds the mic. Scott's idea for a closet is better but I get by pretty good with the mic stand "Hood." It is critical to isolate the vocals so they don't go "out into the room."
3.) A good pre-amp for the mic.
4.) A good audio interface.
Some people bypass the pre-amp and plug the mic straight into the audio interface and use the phantom power there. (A condenser mic needs phantom power.) I choose to use the phantom power on the pre-amp and leave it turned off on the audio interface. The pre-amp lets me EQ stuff before it hits the audio interface and I like that.
Other than that I think Scott covered all the bases and he is correct. We all have slight nuances in the way we tackle this though.
* Though Scott has told you not to, and from a purist standpoint he is right, there is nothing to stop you from closing the door and secretly putting a Boss VE-20 Vocal processor in between the mic and the board. Just for fun. Heck, you only live once, and you do have a software company.
Live a little.
