I am a big fan of trying to make everything from scratch at least once, but if find a great store bought item or ingredient, I will definitely use it. The brand Deep makes an absolutely fantastic coconut chutney and then I recently tried the Madras tomato chutney that was recommended to me by the owner of the Indian market down the street. It was really good as well!

Both the coconut chuntey and tomato chutney are great with idli and dosa. Here are a few recipes in my blog that are related:

Stuffed Idli
Idli Sambar
Mysore Dosa
Quick Sambar