[Heatley]

I'm planning on buying a pair of M50's and I wanted some suggestions on a headphone amp and DAC as I'm new to the Head-Fi scene. I'm not looking for a top of the line audiophile set-up. Just an upgrade from my Studio Beats (I know I'll get ripped on this). I'll be using my computer as the source and I have a good sound card already, so I assume I just need a DAC and headphone amp. Am I correct? Also, where can I download lossless music? Even iTunes music is only 256 kbps and that costs $1 a song.
 
Thanks