Well?

I'm upgrading my mini-ITX HTPC build with better audio and a video card for some gaming. Since I won't have any PCI slots available, I will need a DAC/AMP to drive my headphones (Sennheiser HD650/Hifiman HE-400/other, have decided yet). My budget is anything under $500, but, I don't have to...

I'm looking for an upgrade to my Sennheiser HD555. I have an HT Omega Claro Sound Card (with built-in headphone amp, up to 600ohms of impedence) that will be driving the new cans. My early interests: •Sennheiser HD598 •Sennheiser HD650 •Ultrasone Pro 900 Music that I enjoy: dubstep, metal, rap...

Currently using Sennheiser HD 555s stock (no mod) with the HT|Omega Claro Halo stock (no mod) sound card.  No speakers.  This setup powers mostly gaming and fast, BASSY music of many genres.  **Me likey the clean, deep bass.**  I do enjoy this setup, however, another full system upgrade is...