Ok, here's all the details I can muster up:

SVT w/ 81K miles
Today when leaving work, A/C started blowing warm. Also smelled a little musty.
Noticed a loud hissing / leaking noise. Comes from the passenger side of the engine bay.
When the A/C was off, the noise was considerably louder.
When the car is stopped, a lighter hissing noise is heard from the area circled in this picture. The hissing stops eventually.

It's not exact, but I isolated it to that area and I'm sure of what I circled.

My guess is either a leaky hose or a bad A/C compressor. Any other ideas? How much might this run me dollar wise?