I'm getting my daughter a Pioneer we-go 3 for Xmas and was going to use it myself for bar gigs.

I'll be using my Mac for accessing music through, but was wondering if anyone can recommend the best software for compatibility with Beatport pro.
I don't want to have to start re-tagging files and keys etc.

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I'm probably not the best person to answer this as I'm only a light DVS user myself, but rekordbox would be the obvious choice as it's the native option for Pioneer.

If your music is in AIFF then there's no retagging to be done as the format contains everything and should import fine. I think if you collection is mp3, then sadly iyou're going to have retag everything unless software allows imports of xml databases.

Other than that, hopefully Sarah or someone else can chime in with some other options.