You should take a look at Music Brainz Picard. It does a really nice job. I've been trying to remember to run everything through Picard before adding it to iTunes.
There are some vinyl rips in my collection, but generally I try to seek out a better master (typically from other people's comments) before choosing a source format.
I'm interested in having a turntable more because of the "whole experience." When Daft Punk had their little trailer video, it made me really want a copy on vinyl because of the packaging. Same thing for all the modern TOOL albums.
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