Well then....and this is not a suggestion, but what works for me in a pair of open phones from the near-opposite ends of the sonic spectrum. And these are the Alessandro MS2i and the Sennheiser HD600.
With these guys I get almost the entire range of music covered with near-specialized cans at each end, but with a darned good overlap in the middle to be able to study the tunes from two distinct angles.
Using these two as an example, the MS2i sells for $300 and the HD600 for about the same. However; the very very close HD580 sells for just a bit over $100 or so.
Again; this is just an example of what works quite well for one very satisfied listener.
I find them to be a good contrast/compliment to one another. I also happen to use them on the amp that the OP is waiting to receive, thought the 325i has been getting all of my attention lately.