If I do end up needing an amp I'd prefer a stand alone unit.
I've been meaning to put together a stanbdardized list. For now, I have a few albums that I've listened to a LOT over the years, which I ripped to FLAC for testing: Shpongle "Are You Shpongled?" is one of my all-time favorite albums and it's great for testing detail because the music is so layered; detailed headphones bring out sounds you didn't even know were there. Bonobo "Days to Come" (picked for familiarity) and Hiromi's Sonicbloom "Beyond Standard" (jazz!!!) are two of the others. I need to find one or two more that have more variety.
I don't know if I've heard of any of these bands/acts. You have given me some investigating to do :)
Was looking at that monitor too. It was a tough decision but I was torn between that as an IPS option and the BenQ XL2420T as a 144Hz option (although, for some reason it says in the menu, optimal display is 1920X1080 @ 120Hz). I decided that I was more interested to see 120Hz+ in action than an IPS. Still wonder about it though. Mind you the picture quality of the BenQ is pretty nice and has the least amount of motion blur/ghosting I've experienced.