I also have a KEF LS50 on my imac with a chord mojo, decware zma amp (40w tube) and a small subwoofer (velodyne minivee 8"). I'm not a fan of subwoofers unless necessary but the little ls50's can only move so much air. I've tried the wireless LS50's but wound up returning them after a week. They had much better low end but they just didn't sound magical to me. This could have been due to tube amplification on my passives, also partly to blame for the weaker low end.
Anyway, if you love the LS50's, the Blade's are another level. I find both of them to be amazing. I had a pair of Reference 1's for about a year and I would describe those as being close to what Blades sound like, but still missing the low end. If you happen to be in NYC, you can come hear them.