360 on a PC Monitor

I recently got a 360 + mw2, and want to play it on a PC Monitor with headsets. Default cables that came with the 360 don't connect to the monitor. Nor do the HDMI adaptor cables.
I have an old Sony monitor and a Samsung "SyncMaster731B". Are there special cables I can buy that will connect either of these two to my xbox? Does Target carry them? How much do they generally cost?
How would I set up my sound to go though the weird speaker thing I have my PC plugged into?

The xbox360 has a VGA HD cable to connect it to your PC monitor. It also has 2 audio cables with tulip connections for sound (stereo) or and optical digital output for 5.1 surround speaker sets.

They're not that expensive (30 dollars?) and -very- worth the image quality boost compared to a TV.

Only thing is that you might see a lot of ghosting on old LCD monitors playing a FPS.