Well, it looks like you are in the UK, so I would assume most of your shows will be in PAL format. As a general rule, the less changes you make to video, the better it works, so the closer you can come to the output format you are going to use, with your video initially, the better off you will be. Changing frame-rates or formats will almost always degrade the video quality. The less compressed the video is to start with, the better your results as well - nothing like re-compressing a highly compressed video to cause significant losses. These are the same basic rules we use when editing video in a video editor so they are just some basic guidelines, the final output format, what you are doing with the video etc all are factors.
You can't have too many gadgets or too much disk space !!
mikey (PSP4, Photoshop CS5, Vegas Pro 10, Acid 7, BluffTitler, Nikon D70s, D300s)
Lots of PIC microprocessor stuff too !!