NIB, does not necessarily equal no work. Often you need to fine tune a new game or it has issues. On JJP Pirates, I think a different thing went wrong with every week at the arcade (hopefully the QA/QC is better in the new factory). And not to bash, JJP I have also had NIB issues with Sterns and others. Sometimes buying a lightly used HUO game, gets you a discount and hopefully all the fine tuning has been done by the first owner.
As to your second pin, I would highly suggest a deeper rule set game and as others have suggested a theme that resonates with you. Better to try something first and read reviews, rather than buying site unseen. I have had games that I don't like the theme and/or game play and despite rave "reviews" from others I couldn't get into them. I think Jurassic Park and Star Wars are great examples of good themes and great games. These continue to earn well at the arcade and people love to play them. Attack from Mars and Med. Madness fall into that category as well (however, the rule sets are not as deep).