Apple254 just replied to your pm but thought i'd post something here as well.

I had the voyager for about 6 months last year hooked up to an imod and vcap dock . It was mainly used with the livewires but tried it with the HD650 as well. IMO its does an ok job with them but it really lacks the punch and detail separation that you get with a home amp. You really need to crank the volume dial way up to get a decent level of sound with them. At the time i had mine it was a definite sound upgrade from the rsa tomahawk, but since then my eyes or should i say ears have been opened up to other options and i would have to say there are perhaps better portable options out there.
If you really want a pair of 650's i would definitely recommend getting a nice ss desktop amp for them instead. I used the gilmore lite with mine and really loved the sound combo, it retails about $400 new but they can be found for less in the FS section. I'm sure other's can recommend other good amp choices.
You should try and find a retailer with a good return policy, that way you can get a chance to audition them and can return them if they don't suit.