I hear ya...the Lyr is really addicting, especially with decent HPs. I have the Audeze LCD-3s paired up with it and the sound is just amazing.
Enjoy the music my friend!
The Audeze are a little out of my reach, currently!
I'm going to put aside £500 next month and have a good search. I'm looking into the Beyerdynamic T 90, HiFiMAN HE-400i, Grado RS2e. I found a Hi-Fi shop literally 5 miles down the road from me yesterday, so I'm going to arrange a trail of each of those, the only Audio Technica within my budget they sell is the ATH-AD1000X, I'll look into those, but purely from an aesthetic stand point I'm not over struck!
I like my K550's, but they don't stock AKG, I'd look into the Q701/K7xx otherwise. I'm just looking for a great pairing with the Lyr 2 & BiFrost. I'll have a better idea after I've been to 'Hi-Fi Lounge' next week.
They sell Naim also, so i might look into picking up a Nap 100 power amp to tie in my B&W's. I haven't been into Hi-Fi for about a decade or more, having significantly more disposable income than i did in my early 20's leaves me feeling like a kid in a candy store!