Finding The Right Mic - "Recording Vocals for Backing Tracks At Soundback"

After all is said and done with regard to getting a quality vocal recording how important will the microphone be in achieving this?
I will leave this on blog for the day or so to see what responce is forthcoming and then I will give my thoughts and opinions.
In the meatime here is a backing track that I suggest would test the best of singers.

http://www.soundback.co.uk/mp3/MARIAH-CAREY/Hero/1338-mp3-backing-tracks.php