At least 85%, if not more of the success of the wedding reception comes from the DJ. With that being said, wouldn't it make the most sense to channel more of your budget into ensuring you have the right DJ in control of your night? After all, this is one of the single most important days of your life. The best price is not always the best deal. Shop around. If you don't like the DJ's that your planner / coordinator send you, by all means check out others.
A true professional DJ will often invest numerous hours of time into your event prior to arriving at the venue even though it looks like they come and set up for 4 or 5 hours. A true professional DJ will take a vested interest in the success of the night and in order to do that will perform consultations with the bride and groom to pose questions on musical taste. Also, these consultations can be used to allow the bride and groom to get comfortable witht their DJ. After all, the pressure is on for them to perform and make your night the best it possibly can be.
Always meet your DJ. Do they have exceptional reviews? Do they have a professionally designed website? These are all important factors in DJ selection. Be sure you make the right decision on your DJ.