I haven't heard this ATH-PRO700MK2 yet nor M-Audio Q40 so dunno how they stand in deep/upper bass balance but you seem to be the person who wants a decent amount of both and AFAIK Q40 should deliver that based on some reviews I've read, I know for example XB500, D5000, D7000, LCD-2 does this too but they are all a bit out of your budget except for XB500 which doesn't have what I'd call "crystal clear highs", at least without a decent amount boost to them on a good quality EQ but I believe Q40 is also described to have gently veiled highs.
The ATH-PRO700MK2 does look tempting to me as well, it recently got released so there's not much info to go by yet and availability is very scarse in europe so far, amazon.co.uk seems to have some1 importing from a japan retailer and it costs like £142 so not sure I'm willing to jump on that.