I think there’s a real danger here in having too many variables to account for - simultaneously choosing headphones, a DAC, an amp, determining if the whole thing needs to be balanced - and these variables making the decision overly complicated. It also increases the risk of you not getting the right setup for your preferences and budget. And making all this even more difficult is the fact that you have a limited window in which to make a decision and buy stuff, before you’ve even heard any of it, in order for your friends can bring it back to the UK for you. A lot could go wrong here.
There’s also the important issue of overall synergy in your setup. An amp that might sound great with one set of headphones may not with others.
I’d recommend that you consider breaking this decision down into discrete steps: making a decision about which headphones to get first, and then choosing the amp and finally the DAC. I realize, though, that you’ve got a limited opportunity and time to make a decision so I hope the following couple of suggestions help.
1. Auditioning Headphones
To identify which headphones you want to get I’d strongly encourage you to audition the headphones first. I’ve encountered headphones that I thought I’d love - from the reviews and online impressions I read - and that, when I heard them, I didn’t like at all. $700-1200 is a lot for a blind purchase. And if you don’t know what the headphones sound like, you can’t make an informed decision about which DAC or amp to buy to pair with them. A warmer-sounding pair of headphones might become overly warm with an Asgard 3, for instance.
Since you live in London, you have a bunch of opportunities to audition headphones at shops like Audio Sanctuary, Spiritland, and some of the Richer Sounds branches (the one in London Bridge might be a good one?).
If any of the headphones you can audition is really appealing to you, you can rule out headphones like the Elex that you can’t audition before purchasing. Then again, if you don’t like any of the ones you audition in London, you could take a risk on buying the Elex or OG Clear (I assume the OG Clear is hard to find for audition in the UK now).
2. Buy and Sell Gear (for as minimal a loss as possible)
An alternative approach might be for you to pick up second-hand Elex or OG Clears, that you can’t audition in a shop, and then sell them again for minimal loss if they’re don’t tickle your fancy.
Can you run over budget temporarily and then sell off what you don’t want? I ask because, if you can bring back a bunch of Schiit and Drop items to the UK from the US, you might be able to re-sell them in the UK without losing too much money - I’m assuming here that the scarcity of Schiit gear and the OG Clear as well as the Elex in the UK would make for decent re-sale prices. If I’m right about this (and I don’t know that I am, so it would be best to look into this beforehand), you could have a lot of fun experimenting temporarily with a bunch of gear and then sell off what you don’t like.
3. Calculate an Overall Budget
You’ve mentioned $700-1200 as your budget for the headphones. Does that include the funds from the sale of your current stuff? It would be helpful for you to make a firm decision about overall budget so that we can offer advice about appropriate DAC and amp pairings (again, because of too many variables).
I’d recommend putting as much of your money into the headphones first. Some of them, like the OG Clear, don’t have finicky amplification needs, and while they scale with better gear, you could get an affordable amp now and upgrade later. A better headphone might also serve you well for many years. Personally, I’d go with a $1000 headphone and $200 invested in a DAC and amp, and then I’d upgrade the DAC and amp later. Do you want to make a one-and-done purchase, though?
Alright, this is getting too long. Two last thoughts: I love Schiit Audio’s gear (I have the Fulla 2, Magni 3, and Bifrost 2, and I’m saving up for the Jot 2). But given the production delays, and given that you might have a hard time with any warranty issues that might come up, is it worth buying Schiit gear?
Finally, and I think this gets us to the heart of your dilemma: is it better to spend, say, $600 on an Elex with $600 invested in a DAC and an amp, or $1000 on a pair of headphones like the OG Clear, and $200 in a DAC and amp?