I'd recommend getting the SRS-4170 kit, which consists of SR-407 headphones and SRM-006tS tube driver. It is best to start with a full Stax setup, get to know the "house" sound before changing amp. I did compare the sound of my friend's SRM-006t and my SRM-1/Mk 2 P.P. The former has a warmer and rounder character. Bass was not as impactful. The same headphones on my Stax class A amp has a very impactful bass, but the sound was brighter. I won't call it bright, neutral is perhaps the better word for it.
My friend also auditioned the Perfect Wave Mk I. He too was not impressed. He is a Berkeley Alpha user. Now he has Alpha 2.
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Yep those Stax are killer. I need closed phones the the next year or so, and I'm considering selling a bunch of gear to go for a Stax 4070 powered by a relatively modest amp like the Woo GES. But I like to have a bunch of headphones and amps around for review purposes, so people can relate to them.... So I haven't decided.
I recently compared the D2 to a Perfectwave mkI unit with a group of friends. We all found the D2 superior. Frankly, I'm not that impressed with the PS Audio unit. I may be the first person ever on the Internet to say that.... But it just didn't do that much for me.