Quoted from modfather:

Why did you sell the Met and SM ? Seems like good choices right there. Any advice would be futile at this point.

Quoted from Eskaybee:

I have a small collection (3) and have IMDN PRO and ACDC pro vault next to each other. One is designed and rule developed by #1 player in the world, Keith Elwin. The other designed by the flow king Ritchie and programmed by the legend, Lyman Sheats. They really compliment each other very very well. IMDN is more of a quest and objective based game, instant classic. ACDC is missing one or two alternate type modes (Oii mania and perhaps a mini wizard mode) but it is just a feel good fun game to shoot and rock out to. I owned an acdc premium for a year+, and while the drops are fun to hit with the cannon and the tnt target/mech is great, I prefer the pro gameplay.
That said, GOT PRO would compliment IMDN very very well, maybe even better as it’s not a music theme game. I have a few issues with GOT PRO that keeps it out of my lineup but that wouldn’t bother most people; plus I opened it for 2 years.
My vote. GOT PRO first, but can’t go wrong with acdc pro either.
TWD pro is another fantastic choice if you like the theme. But it doesn’t flow near as good as IMDN, GOT, or ACDC.
As for LOTR; this is a fantastic single player game. It’s great for a small lineup that doesn’t involve multiplayer games. Just be prepared for a long epic journey.
Speaking of multiplayer; if that’s what you’re after, then acdc is a must.

Quoted from Eskaybee:

I’m a fan of both bands as well. ACDC is THE definition of a music themed game. The integration is spot on near perfect and feels so good. Best music themed pinball IMO. Iron Maiden doesn’t feel quite like a music themed game to me, it’s more of a legacy of the beast theme. The call outs and rules is what makes this game, not the music. Which is why they compliment each other well. Luckily for me though I can say this having a 3rd non music themed pin in SW. don’t know how I would feel not having that 3rd option to rotate to which is probably another reason I lean more towards a GOT PRO or TWD PRO over acdc. But man, acdc is a great music game. Can’t go wrong, but a tough decision for sure