What is the source you are using? What type of environment will you be in?
With your budget, perhaps a better solution might be 2 different devices? Maybe something light and prortable to pair with the SE530s if you are using an mp3 player, and something with a bit more power to drive a pair of HD650s if you are listening through a computer in an office or someplace with acces to electrical outlets.
How portable do you need it to be? Does it just need to fit in a bag so you can travel with it, or does it have to run on batteries for extended periods of time?
Edited by sonitus mirus - 8/12/10 at 1:56pm