Nothing beats the sound of a great singer, in a great room, using a great mic connected to a great pre-amp, recorded by a great engineer. There are no easy shortcuts. If ANY of those variables are missing, then there is no magic. But magic aside, the quality of your preamp and/or converter is the link in the chain where you, as producer, may have the oppurtunity to enhance your production. Spend the money and buy a top-of-the-line converter like, perhaps, the great Apoggee products or something similar. That way when that great vocalist walks in the door you'll be ready!