in the last few months, i am builing a 5.1 system. I have got a onkyo 607 amp, with kef iq5se's, and iq10's and a centre. I am now ready to purchace the sub. Looking at things i have come down to either the kef kube 2 or the kef htb2 (pebel). Could someone please help! And advise me, i would be very greatful.