You can't properly drive the nearly $1,000 planar LCD-2 without a decent (probably desktop) amp--so strike it.
If I were you, I'd get the HE 500 and something like the new Asgard 2 desktop amp. This assumes you already have a good DAC--built in or otherwise--and are OK with heavier planar cans on your head for the length of your listening sessions.
Also study this:
Edited by KG Jag - 2/9/13 at 1:36pm