To be frank while a client requests you to do something a certain way, ultimately you are the designer are you not? You should be able to point to your client what will or won't work. Letting them trample on you only hinders the process and/or the hidden talent. At least I've always maintained this with my clients. Have to put your foot down once in awhile.

Clients never provide you all material you need huh (re: hi-res + logo). Or they take weeks/months.. :P