Keep in mind - your the professional here, you must keep your clients going in the right direction, 90 % of clients do not understand marketing at all. Also keep in mind that 87% of "prototypes" are sales. Redesign his logo, his business card and letterhead and present it to him with a dollar amount. Most likely he will buy and at that point you have successfully done your job, you have given him his Business Cards which is what he originally wanted and you have put together and "Identity Package" for him that is clean, nice and effective. Also you have showed him that you care about his company and your committed to helping his company be successful - Key way to keep clients! just my two sense.