haha...mojo for the truly manly.
Right, but I was responding to a post about a need to upgrade to the E11K from the E11 - I'm not saying that an E11 is all you ever need.
I liked the Valhalla with the 650 quite a bit and I also found it was fine with my HF2 that were 28ohm cans so the whole impedance mismatching thing isn't always that important. If the 325is is as bright as I suspect it is, a little tube softness won't hurt it at all.
I highly recommend the Magni (works great with Modi too), I've never needed to turn the volume dial more than half way on the magni, it drives the HD650's very easily and really sounds great. The amp works well on low impedance headphones too, I've used it with HD5x8 series and still use it for my SZ1000's and I love it!
What headphone will you use the most? The Valhalla is very good (I have heard the Magni, but only a little and it was driving my departed D7000) so not much help there. Again, I would stress that I think the impedance mismatching is likely somewhat over-emphasized. I wonder just how audible the effect of mismatching is? I'll bet you the vast majority of people who think they could hear impedance mismatching with a dynamic headphone probably in a blind test really couldn't, or at least not consistently. Just before I purchased my Valhalla I spoke with Jason from Schiit about using it with my 28ohm HF2 and he had this to say. Even though on paper mismatching can have an impact, he knew of friends in the recording industry that were using the Valhalla with low impedance headphones and quite liking the combination. I know I did. I can't say my experience is what you will have, but I feel confident in saying if the impedance mismatching was there, the audible effect was quite small. There is a big difference between measurable and audible. I am sure there are cases where a mismatch may be particularly bad, but I don't think that is anywhere near as common as you would think by reading about the dangers of impedance mismatching.