I've tired wharfedale diamond 10.7 too. As well as pioneer Andrew Jones 5.1. Both sounded pretty great and quite similar in sound quality actually (diamond having a worse soundstage). I've been told that the diamond 10.7 was under powered by a bad amp because they were under equiped at the showroom.
Because of all the different setup conditions at the showroom, it's quite hard to tell which is better. A well calibrated speakers in a room can really make a difference. I've heard the Klipsch rf260 5.1 in a well-calibrated room with all the acoustics furnishing in place. God, it was so pleasing to the ear. But the exchange rate on that was 3.0-4.0x (when it should have been 1.4x) so it was a pretty bad deal. Couldn't justify that price tag and thought I could get better value from elac or monitor audio with much better exchange rate and same price range.