Go for the 650. That's just a blanket statement. I'm sure there's someone on here that can provide a proper answer to compliment your setup.
What kind of sound signature are you looking for?
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Headphones: Equation Audio RP-21, Sennheiser HD555, Amp'd Noise Cancelling Headphones, Panasonic RP-HTX7, Various Vintage Sets
Earphones: e2c (modified), Skullcandy ink'd buds, ATH-EC7, Various modified cheap chinese knockoffs
Home amp: Eico HF-81
Portable amp: C&O Box V2, Go-Vibe V6 with 24V Elpac
Portable sources: 2nd Gen iPod Touch, 3 Zune30s, Shuffle 1st and 2nd Gen, Sony VGF-AP1L
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