Alpine Headunit with Alpine Speakers?

I have pretty much no experience with av or car sound setups in general, but I'm currently looking to modernize my car's system. Have found an Alpine cde-9870e for a good deal, and was looking for some smaller speakers and found some Alpine S2-S65C's.

Is it worth it to be matching brand to brand? or does it not really matter? If there's a fair advantage to it, or if it's something not to worry about.