JBL Speakers?

I understand that many of you prefer not to have rear speakers, but I have found that I really like the sound much better with rear speakers. I was going to replace my rear speakers with a set of MB Quart 2-way coax 6x8" $100, UNTIL I was browsing sounddomain.com and ran across a set of JBL T595 3-way coax 6x9" that were originally $300 but are now only $123 on a special deal. What should I replace my rear speakers with? Which are better quality and sound cleaner? I am getting MB Quart components for the front, so is there any benefit to having the same brand for the rear? Should I go ahead and put the MB Quarts in the rear, but also buy the JBL's because it is such a great deal and just hold on to them for something in the future? Thank you for the advice.