Looking to make an addition or two to my headphone stable, but I'm having a tough time figuring out which direction I should go.
I currently have the FA-011, HD555, Pro DJ100, and GR07. Of these, the FA-011 gets the most use by far. The Pro DJ100 is second, but only because they're my work headphones. I actually prefer the GR07s to these, but I find them a bit too uncomfortable to wear for 8 hours at work. The HD555s are probably my third favorite, but since they sit next to the FA-011s, they don't get much head time. That's not to say I don't like the DJ100s, because I do - it's just that they don't quite stack up against my other phones when put next to each other.
So what am I looking for? I've been wanting to get some higher-quality closed headphones to round out my collection a bit. Work is really the only place where I need the isolation though, and I'm not a basshead, so would closed cans just be a waste of my money? From what I've read, most of the closed headphones in the mid-fi range ($200-300 ish) are described as basshead cans - i.e. DT-770, D2000, M50. Are there any others I should consider? I was thinking of the FA-003/HM5/etc, but after talking to a few people, they sound like they just wouldn't have enough differences to set them apart from my other headphones
Since the HD555s aren't getting much listening time, I've been thinking that they could use an upgrade to something that can hold its own against the FA-011. This would be more of a neutral/relaxed pair. Something super-comfy for long-term listening. Some that I was looking at for this purpose are the HD598, HD650, and HE-300, leaning towards the HE-300. The reason for this is that the HD555 clamps a tad too tightly for my taste and the HE-300 has that nice bendable headband. I have a small head, but for some reason, the angle and position of the pads on the HD555 causes intense pain behind my ears after a couple hours. Anything else I should look at?
And finally, I've been thinking about a more powerful amp. I'm currently using the E10, and I would keep using that as my DAC for now since I like what it does for my headphones, but some of the headphones I've been looking at getting either now or in the future need a bit more oomph than it can provide. The easy (and cheap) route here would be the E9, but I really like the styling on the Schiit Asgard (and it seems to pair well with a lot of the headphones I own or am looking at getting). I've also heard good things about the Matrix M-Stage and the Audio-GD offerings. In other words, I'm pretty lost when it comes to amps.
For the record, I've tried Grados, and their sound signature isn't for me - I guess I prefer dark to neutral sound signatures. My music tastes are pretty varied, but my library includes a lot of vocals, rock, folk, classical, a bit of metal, and a scattering of pop and electronic. Budget for each item is ~$200-$300.