Whether 6 or 36 qualified candidates, I review all resumes then run a matrix. The matrix is tailored to each particular position being filled (qualifications, requirements, intangibles, etc.). The best fit for the position at hand will be selected (which is not always the top candidate on the matrix, though it is almost always within the top 5). I don't mind a 4 page resume or slightly more. I've found that single page resumes are often too weak (too little experience, education and training, etc.), granted my realm is more within management and training than IT-specific positions. A screening system (questionnaire, etc.) helps decrease the amount of 'pre-qualified' candidates in order to prevent receiving more than 30-40 resumes for a given position to be filled.