Best headphone amp for Sennheiser HD 598s?

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For a portable, all in one external solution I don't know of anything comparable to the GSX 1000. I have not actually used it though so I can't speak to how well it performs. I do have 3 pair of Sennheiser headphones though so I'm a fan of them in general.
"Best" gets pricey quick. Budget and intended use? If you're using them for music you'll want an amp/DAC. If you're gaming you may want a soundcard with an amp and DAC and that also has virtual surround for games.
 

I suppose "best" is some what subjective.I use them for both gaming and music. That being said I use them on various platforms. I have a laptop with on board Realtec audio which is meh, a MSI Vortex PC with Nahimic sound card which is nice I also listen on my iphone, and the tv.
Sennheiser is currently pushing their GSX 1000 model for gaming which runs $230. I would like to spend anywhere from $150-$250 range but if you know of something noteworthy which exceeds that budget I'd be interested in hearing about it.
 
For a portable, all in one external solution I don't know of anything comparable to the GSX 1000. I have not actually used it though so I can't speak to how well it performs. I do have 3 pair of Sennheiser headphones though so I'm a fan of them in general.
 
Solution

Well barring any last minute suggestions I'm going with the GSX 1000.

I thank you for your input and declare yours "Best Answer!"