Tentatively considering a NIB purchase (first and probably last) but with a good crop of decent pins available I'm procrastinating. Narrowed it down to:
AIQ
IM
ELVIRA HOH
ST
JP
Vallhala
Mando
And before anyone says it, I can't have one of each
whatever you do don't go to the London place until after the end of November otherwise you'll end up buying Thunderbirds. They also don't have EHOH or IMDN.
PAX: I've got all those games except Valhalla but honestly wouldn't pick that as a game to buy, and if you wanted to pop over to play them happy for you to come down. Its a trek but I'd really recommend you play them. Kirk has some of them in Tilt, Flip Out has some of them also or you can goto the place pinball machines go to die.
At the outset though it very much depends on what game you want to buy:
Elwin games are fantastic but JP2 is not for everyone, of all the Elwin games JP2's have been re-sold the most. I would definitely play this as much as you can before buying - its a fantastic game if you are decent at pinball and can put the effort in to get good on the shots. It can be super frustrating though.
Elvira/ST~ are very similar games both fan layout both slightly easier on the player but both fantastic to play. Elvira is more pricey though but alot of fun. if you can stretch to Elvira then AIQ Premium becomes a distinct possibility:
AIQ is a fantastic game, huge depth but (and watch all the pro owners disagree with me) but without the Captain Marvel ramp the game isn't as anywhere near as good so you really really want a premium (£ more).
IMDN another fantastic game and challenging - if you like IM then I'd consider it for sure, but you can probably pick up a decent one used and save some dough lots to do and again will keep you busy for along time.
Mando is a very different game with early code but its developing well with how you have to link the modes missions multi balls together to score big points on it