If you can, go audition the speakers. It can really help you make a decision.
But out of your choices, I'd probably go with the KEF. I liked their Q range, but seems to be overpriced / always out of stock here (Singapore).
An alternative that I shortlisted (but didn't get a chance to audition), was the Dali Spektor range. The centre is called the Vokal. Can't go wrong for 200 quid (from Richer Sounds)