Thanks for the input guys. Dubstep Girl, when I say aggressive I might be using the term incorrectly. Classical and Jazz sound great. I was listening to a Bach cello piece on friday that took my breath away but with rock music mostly I hear is guitar and vocals. Bass guitar and drums sound like they were recorded one room over.
Scuttle, I can't add VSTs (as far as I know) to either Amarra or Audirvana. I can in Fidelia though so I will keep messing around with it.
Kramer, I hear you about the headphones but I am having a really hard time believing they are the cause. I am often wrong. I thought of buying the Schiit boxes simply because I have nothing to use as a comparison to what I have. I want a different amp and dac so I can mix and match pieces and see what sounds like what. Since I don't know any one who is in to this stuff I have to buy it and those wee amp/dacs are cheap (and if they aren't needed would make a great Christmas/Birthday/Anniversary present for my wife! soon to be followed by divorce papers).
The amp simply won´t make much of a difference. I have integrateds here that sound exactly the same as my Little Dot IV. Considering their types are totally different, as well as their topologies... Even if my ears are bad (which they aren´t), differences between amps are small at best - provided they measure well.
You're looking for substantial changes in the way the HD650 presents music, changes the likes of which will never be brought about by switching between adequate amps.
I have heard the Little Dot 3 and it's pretty much identical to the Little Dot 4. When I say that, I mean that I don't think I would be able to discern them in ABX testing. In turn, my little dot iv sounds basically the same as my essence and as my marantz integrated.
If you already have a great amp (such as the LD3), stop messing with amps and try different headphones. If you are an intelligent user and are able to account for psychoaccoustics, you will find, maybe in hindsight, that anything else you tried to do was foolish.