Surely we can all agree; above a certain (possibly relatively low) price point, the law of diminishing returns bites hard, really hard. It's a question of how much you're prepared to pay for that extra that perhaps takes a really good system and makes it truly silly grin-inducing/foot-tapping/head-banging/dance-compelling/whatever floats your boat?
As I've said in other threads; I've still to audition the standard 105, although I very much look forward to doing so ASAP. I was just wondering if I ought to be aiming a tad higher, bearing in mind that I'll be keeping it for years. :?