@Scrobinsruns a currently available thread here:
For recommendations:
My personal favs on currently available are Nebs n Debs, Haunted Halloween 86, Trophy, and NES Virus Cleaner.
No longer for sale, but on the secondary market, I'd recommend The Incident, The Mad Wizard (ROM is free), and Cowlitz Gamer's Second Adventure (ROM is available with suggested donation).
If you have genre types you like, we can nail it down better.