Hoochy - pre-produced walkthroughs. GuilleAcoustic - Looks very nice - I wonder whether you could do a pre-produced walkthrough that would get rid of the noise though.. Guinevere - good spot about the number of cores. That's a good point about the custom rig vs. buying from Dell/HP - I suppose a concern is the premium they add on (I presume they do?). OK thanks Archtronics that's useful. They've had problems with file sizes - the larger sites exceed 150GB which then have to be reduced to less than 100GB due to hardware limitations (I believe..)