Various Frame Rates, Audio Rates, and Compression in my FCP Timeline

Hi Creative Cow,

I'm currently editing video for the web and have found that since we're grabbing media from DVD's, YouTube and shooting our own footage, I'm often stuck with a timeline that contains a mixed bag of Frame Rates (as low as 10- 29.97), audio rates, compression types and data rates.

My head always feels like it's about to explode every time I open my timeline and I'm not sure of the kind of settings I should stick with. Right now I'm just working with the parameters of my final output to determine what I edit in. But since most of my media isn't set to those parameters, rendering is often frustrating and requires a lot of my computer.

Andy advice on workflow? I'm beginning to feel like a mini-telecine operator.

Thanks.