According to YouTube video from 2008 Hetfield's live rig is a JC-120, 4 x TriAxis, and 2 x Diezel VH4.
+1, and modified Triaxis's. blended with Diesels.
Now besides that, if I look at the first names in your list, these have all articulate soloing kinda tone, so I don't think you main concern is Metallica tone right ?
When it comes to versatility btw... I now have again a Legacy I, and rediscovered it. Clean tone is still the best I've heard. Now the lead is really creamy and crunchy, rather mid oriented. However, you absolutely need booster pedals with this amp. And just get several different ones and there is your versatility, switchable at your feet. The base tone of this amp is so openminded to say so, that it takes all kinds of pedals very well.
Also, a MUST
is an equalizer, and it's not in your list. This is the ticket to tone shaping to you personal preferences with a Legacy. These things made all the difference for me from not knowing how to handle a Legacy because I didn't know better, to enjoying it now a lot more.
Unless you care for the Legacy II's lite crunch channel, I'd rather go to a Legacy I, you can find these for really nice prices and seem to have a better clean than a II. Their clean also takes distortions well, so a Satchurator or Line6 Ubermetal give you tickets to amazing tones aw well for very affordable prices.
check these pages for Legacy Clips, a lot of material:
and make your calcutations: what is the cost of a Mark IV, a Legacy I with sh*tload of different pedals etc...
ah yes... and fideling around with some preamp tubes in a Legacy seem to be a must as well, I just ordere some aorund 15$ a piece to have fun.