I couldn't ask for a better portable to pair with those two vastly different phones. It's really ridiculous how versatile and efficient the Arrow is. A lot of us here pair the Arrow with the HD650 and believe it or not, it works extremely well. Personally, I've been cranking the gain on the Arrow up to III when pairing with the HD650s.
I like to drive the volume with the amp and not the PMP. No hiss or distortion, plenty of power, the HD650s sound like they're plugged into something bigger and more expensive, and I get about 15 hours of battery life on full tilt.
I love the SE530s through the Arrow. Some don't, but I get nothing but pleasure. I leave the impedance at 0, set the gain to I or II (yes, II) and bump the Arrow bass boost to I or, occasionally, II. The Shures are bass anemic, but they sound so good driven by the Arrow. Also, lately I've been experimenting with the crossfeed setting and I've left it on setting I for a couple of weeks. I think it makes for a more natural listening experience and with less fatigue for those heads-down moments at work where only metal can distract me from storming into the server room, yanking out all the Ethernet cables and making my own version of the Burning Man.
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@ Mediaogre, How does it pair with the SE530 and HD650?