I am selling an interesting computer setup, one that might be of interest to an audio/video creative who needs multiple video ins on the cheap. The system is a fully working Power Mac G5, dual 1.8GHz, 512MB, with a classic Apple Studio Display screen, all in very good condition.
The interesting part is that installed in the computer's PCI-X slots are three Miglia AlchemyTV DVR cards; each has S-Video and composite video ins and a (probably soon to be obsolete) TV tuner, and the drivers allow for all cards to input video at once. Significantly, this is the case for Max (I have tested this), so you can access three separate video streams with Jitter with this system. (These cards only work with Mac OS 10.4.x maximum, so only Max 5 will work.)
If anyone is interested, I am selling for £150, and am currently based near Bath/Bristol, though might be able to deliver to London (postage is unlikely as whilst the computer is boxed, the screen is not).