I'd suggest going with B&W, Revel, or Paradigm in addition to KEF. These are all good, safe bets and offer various price points. For a receiver (I assume you don't want separates) I'd suggest Yamaha, Marantz, or Pioneer. If you would consider separates then give Emotiva a go. You'll get good value there with a pre-pro and better amplification than any processor. For sub, try going with dual subs. SVS offers exceptional values there. You can get two of their top of the line subs for about 3k. I'd suggest breaking out your budget for a 7.2 setup that is 3k for subs, 5k for speakers, and 2k for a receiver or pre-pro and 7-channel amplification. I personally would go for a pre-pro or receiver with room correction and I would not do the speaker management in the BluRay player. The addition of room correction is a huge factor. And one last tidbit, you can also go for a receiver that offers pre-outs and buy a good amplifier for the front L and R channels.
