AVI -MP4-DVD format: Quality question

Hi there,
I have a number of huge avi formats, and was wondering if I use Nero Vision Express 3 to convert it from AVi to MP4 if there will be any loss to the original quality as it is in MP4 format.
I plan to keep it as storage that’s why.

Also if I convert AVI to DVD using Nero, will there also me any loss to original quality.

Please advise… Also let me know of recommended settings that helps preserve quality.