I think selling the KEF line would be excellent. Keep in mind that your shop would be listed as an authorized dealer and you would be pulling in customers from up to a few hundred miles away. That is ... if the customers desire great sounds.
Disclaimer: I've never heard KEF or Energy speakers. However, I love the looks of the KEF line and would love to hear their sounds.
I would vote for KEF. I'm not that big of a fan of their Q series, but once you get into their XQ and Reference lines, they'll run with anything else in those price ranges. Their Ref series are just downright beautiful speakers, and they are some of the best sounding speakers I've heard under $10K, althought they have some that do go over 10.
I have 2 seperate surround systems both with KEF and I have no complaints. KEF just came out with a 2 speaker all in one system....anyone check it out yet? Seems like a nice bedroom system.