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Make sure you set aside a budget for a pretty powerful amp as well... the HE-500 are a rather picky set of headphones to amp compared to the HD600. Unless someone knows of a better option (cheaper), I'd say the minimum amt. you'll want to spend in order to amp this is ~$400 for something like a secondhand Lyr (Discluding the M-Stage since I've never tried it).
Just looking out for your best interest, and good luck! You won't be disappointed with the sonic qualities of the HE-500, when well amped.
Yeah ill be running it with my current Udac2 to Asgard setup for now(bifrost/lyr in the future) thanks for the heads up though.