I'm confused too. I think I may have missed something - I should point out that I don't see obobski's posts because I got tired of him trolling and posting bogus info repeatedly.
E.M, if isolation isn't a big thing, there are 3x DT990 up on Head-Fi FS/FT for $125CD to $210 right now. They'd...
$1.9M is obscene, unconstitutional, or just f@#&ing nuts. $54k is sane. $500 is reasonable.
To be more specific, $1.9M is a strong-arm abuse of the legal system as a weapon against lower socioeconomic castes.
Right, so, how is it relevant that all existing sound cards use one of a pool of ~3 DSP chips? (exaggerating somewhat, obviously, but not by that much)
1. Your card is still more than fine.
2. The answer is always to wait as long as possible (or very nearly always). The cost of the card you want to upgrade to is nearly certain to come down, and it is nearly certain that your super awesome upgrade target will itself be one-upped.
The Swans, of those you listed. Bass isn't going to be great without a full subwoofer, which would eat your whole budget on its own. But it should be better than most options at that cost.
DT770s are used on Head-Fi FS/FT for roughly $100-150 all the bloody time. If you're patient, an awesome deal. I think they also surplus some models to eBay occasionally.
If this is primarily / exclusively for headphones, Xonar Essence STX is basically the big dog. There are a few other...
DT770s, and if you MUST have digital 5.1, just use CMSS-3D. You'll have a dead solid platform, and you can turn the 5.1 part off and on as desired.
Although at that, there are better things to drive it with.
The deal was actually from J&R.
It's out of stock.
It's a wireless headphone so you have to put up with wearing a battery pack on your head plus interference, except infrared-based ones where you trade the interference for line-of-sight issues and limited bandwidth.
Since the deal is...
I love when people give an example of what they want (e.g. "around ear headphones" or circumaurals) then turn around and say that's not what they wanted at all. It really makes me /facepalm.
If you want good isolation (i.e. the ability to block out external noise) and don't want something that...
A used Beyerdynamic DT770 is pretty much my baseline for gaming & movies, which I assume to be the priority from the 7.1 stuff ($100 used, $250 new). Audio Technica ATH-AD700 or A700 would be a good option short of that (i.e. if you don't have the patience to track down a used set).
AFAIK MMX 300 = modified DT 770s with an attached boom mic. I don't know how they compare beyond that, or how good the mic is, but they should be similar.
By way of another option - there are some headphone-specific sound cards now which, while still not quite enough, should do better than a CMoy. Probably "well enough" for most.
A CMoy would be better than nothing, but much less than it needs.
I'd do one of the Senny models over the Grados. If you're not already a Grado fan, they're not going to be the #1 recommendation.
RE1 & RE2 are semi-open. But they still have IEM-grade isolation, only towards the middle of the scale instead of extremely high. The RE0 is closed. The RE1 & RE2 are enough to completely shut out commuting and "other people" noise sources if inserted properly. Probably not so great for...
You can't get a ground loop on (almost all) headphones anyway...it's only even potentially applicable when you're connecting two devices which are grounded separately. Short version, instead of getting a constant ground level, it oscillates between the two levels at some phase - which looks just...