So much of it depends on the variety of the genres you listen to (especially when some are relatively "harder" and some "softer"). If you're listening to relatively hard music (harder forms of electronic (electro, dubstep, drum & bass, progressive/club), rock, metal, etc.) you'll want a sound signature that is far from the sound signature you'll want for the relatively softer genres (e.g. classical, jazz (the more mellow kind), electronica, folk, r&b, lounge, chill out, etc.) If you listen to a wide variety of genres, I would find it hard to believe that one headphone would be optimal for everything. Personally, I choose the LCD-3 for the harder stuff, and the HD800s for the lighter stuff. The SR-009s sound great, but they're just one sound. Each driver technology has its strengths and weaknesses.
Have you heard the SR-009s? I own the LCD-3, HD-800s and TH-900s (and have owned the RS1s and HE-6s) and if I could only own the SR-009s, I would gladly take that option for all genres that I listen too (rock, metal, jazz, classical, acoustic, etc...). They get the vast majority of my head time as a result.