combining different cables

Someone suggested yesterday to me that I should ONLY use -all the same brand or model of cable [interconnects and speaker wire] to get the best sound. I understand this whole deal is about preferences and based on highly subjective belief systems, but does anyone else believe this?

I could see the need to use a varied list of different brands and models, based on the individual performance I would be looking to acheive from a particular component.

Anyone care to jump in?

Thanks.