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All points come to one conclusion in my mind then, to keep the K7XX and do a full on upgrade! It's not completely necessary to have 2 cans, but it would be nice. I guess then the K7XX can become the 2nd pair for dossing about with around the house (and for games), and the true upgrades for the main listening.
Cheers guys!
I currently have both the K7XX and the HE-400S. I actually got the K7XX the same time as the HE-400S.
Longs story short, got the original HE-400 (still my favorite, sounds the most "planar"), but due to comfort and their weight/fit, I sold them for the HE-400i. Personally, I didn't like those, they were VERY mid-based. Not quite as dark sounding as the HE-400 was for me.
Sold the HE-400i, and was able to get both the HE-400S and the K7XX with the money.\
I agree with previous comments, that they complement each other nicely, but I must say that the HE-400S IS noticeably better. They just sound like planar headphones, dynamic drivers in this range cannot match that sound quality imho. I sent in my HE-400S for repair (bent the headband, my bad) so the K7XX have been my mains for about a month now, but I must say, I hardly listened to them when I had my HE-400S, and they'll probably sit on my shelf again once I get my HE-400S's back this week.
K7XX is very thin sounding, very neutral-like sound. It has a decent amount of mids and a deep bass response (though there isn't much to it). I haven't done the port mod on mine though, I'd love if you could give me some info about that process, or a link, or something.
The HE-400S is more-so like others described, much more texture, and so smooth in nearly all frequencies. focused on low-mid sound, but it doesn't sound like a dark headphone. Slightly smaller soundstagethan the K7XX, but larger than the HE-400i had. The HE-400S is also the most comfortable headphone I've ever worn, even more comfortable than the K7XX's Suspension system to me. Much lighter than nearly all other planars on the market.
If you like treble, soundstage, and want very decent bass, I would also consider the original HE-400. I know this may not be a popular opinion, as the HE-400S is more balanced, but the HE-400 was so much more fun to listen to. It had slightly recessed mids, but a really great V-curve. They are dark, but sound bright at the same time. They were the most "Planar" sounding headphones I've ever heard. Biggest problem is their headband (sorta flimsy) and their weight and comfort.
The HE-400S is more tamed in terms of balance, so if that is your preference, I think you'd love them.
If you feel you want to upgrade yo a higher tier, just let me assure you that you'd have to jump to the HE-560 range of pricing, as I find the HE-400S and HE-400i are nearly identical in performance. While the HE-400i did have superior drivers, its sound signature just ruined it for me. The HE-400i is more similar to a very dark HD650 in my eyes. Even though it was technically superior, the signature just didn't sound right, the HE-400S is much better, and their sound quality is nearly inconceivable from the $200 more expensive HE-400i.