HD558/598 for hall of fame? For $150, couldn't think of any other open headphone than the HD558 I'd rather have.
Sony MDR MA900 Purrin for 140$ (current ebay price), I sold them few weeks ago and regret it so much. however HD650 should be financed somehow, I had no other way. First days I thought HD650 was better but I am not sure anymore.

at least Sony had more engaging sound.
MA900 has some slight less bass texture/definition than HD598/650.