If you are into Metallica, I'd suggest Metallica. It's a TOP game, excellent player. It will also be easier to find and cheaper than an AFM (I know you say this isn't a concern, but trust me, it is.)
You can still buy them brand new or close to brand new easily, and this should be a reliable machine for you. I'd avoid a 90s game at this point since you are a total newbie and life is short - you want a working machine that will stay that way.
You may also consider a MMremake. These are around $8K brand new and I believe they aren't too hard to find - I've been at shows where you could pick them up right there new in the box. MM is one of the best games ever made, in the family of AFM, and should be reliable as the MMremake is a brand new machine.
I wouldn't overthink this one - and I'd avoid older, overly complex games (TZ and STTNG come to mind) that may be troublesome.