Thanks for the reply, I've moved away from the E12 and other portable amps as per everyone's suggestions, also emailing a few stores around me and they're advising the same.
think I may pull the trigger on the M+M stack, they're relatively cheap and fall almost within my budget, plus I get a nice DAC with it too. I listened to the HD650's extensively last night unamped (as I've still yet to buy one ><) and the lack of punchy bass I mentioned before is not really a problem now, I think any amp I plug this into will provide the lower end that I'm looking for.
The mids however still bother me, they feel muddy and show no clarity, especially the vocals still feel veiled on some faster "pop" tracks. Again, I know this will be fixed with a decent amp, hence this post
Regarding your tube amp suggestion, I've also looked at the Schiit Valhalla, but that's quite expensive! Not sure if the difference between the MM is worth the investment now as I would not be able to afford a DAC with the Valhalla. Will the mids and highs sound significantly different that the MM stack to warrant the upgrade?
Does anyone have any other alternatives to suggest that may be friendlier to the wallet? Please bare in mind that in the UK, I think my options are a little more limited/different than the US. I am not really interested in DIY products either.
Aesthetics also play a part in my decision, the Schiit products do look great sitting on a desk.
Thanks in advance,