obligatory: I am not a lawyer.
First off - are you interested in taking a "balanced risk management" approach, or keeping your nose 100% clean?
If what you describe, encourage or admit to on your site isn't illegal, it makes sense that it would be okay. Widespread opinion is that emulator software is unremarkable in itself.
In practical terms, you are probably more likely to be hit by a falling sperm whale than legally done over for mentioning a questionable set of ROMs on your (with respect) niche-interest website. There are just too many bigger fish to fry out there on the web for anyone to really even bother hunting you down. That situation may change in the future, as it did for mp3s - but even then, it's still pretty unlikely.
What I think is more interesting and relevant is leaving an information trail on yourself and its impact later. In 10 years, will you be happy with a potential employer running some clever futuristic background Google/Wayback Machine checks on you, to discover your [em]ethical flexibility[/em] with respect to copyrighted works? I know it's an odd example, but the truth is you never know when something you commit in writing will show up and bite you.
Could the same site audience be wowed by the cabinet itself, some oblique mention of what emulation is, and ample links to sites like BYOAC for more information? How likely is it you'll pick up significant site traffic from people unaware of emulation anyway? ( I know you put a cheesy grin on that sentence

)
I haven't got my site (or cab) completed yet, but I intend it to be perhaps interesting or useful as a project example for others already in the community or who have just gotten the bug. What games are actually playable on it really should be of little concern to most people, who will work it out eventually just by exploring if they haven't already. The world needs more useful cabinet example sites, not catalogues of games

Alternatively you could just
prove they're legal !