First off, I don't know squat about audio except for the recent research on the internet about headphones.

I don't have a stereo, but want to purchase headphones for my PC (music and some gaming). The thing is, will a Creative SB Audigy 2 suffice (TB Santa Cruz better)? I'm sure it will work, but can someone please tell me what the pros/cons are? I'm considering Grado SR80, but I do not want to purchase an amplifier to boot.

Also, is it possible to switch the SR80 cable with a longer one, or is it irreplaceable?