First off I have limited knowledge of CRT projectors and computers and make no claim to being an expert.
If you just plug a DVD player or VCR or other video source into the projector you will not be getting anywhere near the picture quality that your projector can deliver.
So what are you choices? You can use the S-vid input and a progressive scan DVD player, however with a screen that large scan lines will still be visible. You could use a video processor or you can use a computer.
You will have many advantages to using a computer with this projector:
1. You will be able to use the computer as a deinterlacer (using a program called Dscaler);
2. The computer will act as a scaler allowing you to change resolutions;
3. Custom timings and resolutions with a program called Powerstrip. This will allow you to match the projectors sweet spot;
4. You will have a choice of DVD software programs for DVD playback.
I’m sure I leaving a lot out and other people will jump in here. Most of the above was written as if you’re going to be using the projector for DVD playback. There are other considerations as well, OTA HDTV, DirecTV, Cable etc.
The 12xx Sony projectors are quite popular; you might try asking this in the CRT forum.
Hope this is helpful.
Cheers,
Lee.