Kef R series or Tannoy Revolution Series?

Hello folks!
In my never ending search for the perfect sound, given my limited budget...

Currently I am using a pair of Paradigm Monitors I bought in the late eighties and shockingly they still sound great to me but am in the "upgrade itis" situation, amp is the Primaluna Dialogue Premium Integrated. 

I am considering 2 speakers, the Kef Q 750 and the Tannoy Revolution XT 6F.
Can anyioe advise, have you heard both? 
I understand that the Kefs are the absolute entree level, but with 2 kids in college, that's the budget boys and girls!

Let me know what you all think please!