there is 100 dollars between the 650 and the shures you're not even close on that one by your own prices...........you're talking about something that costs almost 40% more. Yes i've heard the SRH940 and it felt like someone was shoving broken glass into my ears but i didn't want to say that since not everyone has the same tastes.
I know you're a self-professed bass-head - but this is rich, and only further reinforces what I've long suspected. I seriously doubt that you've ever heard the 940. For the record I have heard both the HD600 and HD650. IMO the Shure is definitely in the same 'class' - although it has a very different signature to the HD650. It's closer to the HD600 - a little more top end, and a little less bass - but the bass definition is very good.
For the poster's music tastes, I'd have thought either the HD600 or SRH940 would actually match quite well. It's reassuring to see that Armaegis shared the same opinion.