Expounding on the phantom center issue a bit. For about a 10’ listening distance, you’d normally place the L/R speakers about 8’-11’ apart. With your 47” TV, I’m guessing your L/Rs are probably less than 6’ apart in which case I’d live with the phantom center for a while and purchase the sub first.
This would also allow you more time to find a matching center.
Zumbo, snuck in while I was writing up a response:
WOW, I didn’t realize the Kef would be so easily obtainable. I’d pick one up quick if you can.