Recommendations for headphones under $400?

Who would have thought that such a simple quest would turn into such a gnarly affair!

Tim, yes it is a possibility for a qualified electronics engineer to perform, have not researched price yet but still an option.
The h160 may end up being the most sensible option as modifying the h300 might seriously deter potential future owners.
Still also seems a darn shame to have that doorstop of a BAT amp sitting idle too.
Maybe I just buy more speakers and make 3 or 4 systems!

@geoffkait
I truly believe you and agree totally, but it is the hassle of finding something comfortable to replace those foam pads.
I had an old pair of Sennheisers that had sat in a cupboard for 15 years or so and the foam pads disintegrated but I tried them anyway and was pretty impressed with the sq, not so much with the comfort level!
This was a few years ago and as they were only a $40 pair of cans they got tossed. And the experience forgotten about until you mentioned it to jar these foggy old grey cells

" The h160 may end up being the most sensible option as modifying the h300 might seriously deter potential future owners.
Still also seems a darn shame to have that doorstop of a BAT amp sitting idle too.
Maybe I just buy more speakers and make 3 or 4 systems!"

Hi uberwaltz,

I would think that modifying your H300’s pre outs so they function as true pre outs would only increase its value since others would likely realize the value of this mod just as you have.
Your Bat-VK600SE is an expensive, well respected solid state amp that you’d likely be able to sell for a significant price if it’s in good condition. Why not sell it to finance the H300 mod and a good headphone amp? You’d also be freeing a good amp from a doomed fate of collecting dust in a closet to do what it was made to do: drive high quality speakers with high quality amplification.
I would suggest the following course of action:
1. If you like the performance of the H160 in your system once you audition it, buy one and sell your Hegel H300 and Bat-VK600SE.
2. If you like the performance of the H300 more than the H160 in your system, have the mod done to your H300’s pre outs, buy a good external headphone amp of your choice and sell your Bat-VK600SE.
3. Avoid buying more speakers and making 3 or 4 additional systems.

Scenario #3 only proliferates the number of your home systems in which you are unable to have a good and convenient method of listening to headphones in.

Both scenario #1 and #2 ensures you have both a good amp that you like driving your speakers and a good amp. either internal with the H160 or external with the H300, that you like driving your somewhat inefficient Hifiman 400i headphones.

I hope my suggestions helped you a bit,
Tim

It is not difficult to make foam pads/headphone covers.

I experimented with different densities, and was able to cut
pieces of foam with a kitchen knife and scissors.  For my Grado 125s
I used a quarter for the size of hole of the inner circle (closest to the ear)
and played with the size, shape, and thickness of the rest of the piece.
I think my version sounds much better than the two optionsthat I have bought
from the manufacturer.

When you get packaging material in the mail, it isn't hard to wonder,
"what can I creatively manipulate in the quest for better sound?"

Well for now I have taken up the offer of the h160 on home audition, expected to see it Friday or Saturday and will make decisions from there.
Personally I think it will likely be the right move and will put the h300 and the BAT up for sale.
Happy listening ahead indeed