One thing that might be worth looking at is a line booster box for the S-Video out to allow you to position the PC a distance from your screen (so you won't suffer the fan noise and so forth). I can get one here (in NL, for about $50) that lets me run an S-V over a distance of about 15 metres instead of the recommended max of about 1.2 metres.

One of the few remaining Mk1 owners... #00015