Card in Envelope and Card in Balloon are essentials that most magicians should know.
Card
repeats seem to be uncommon today -- I think it's because the audience has a good idea of what's
happening, even if they don't see anything suspicious. I like Dan's Frisbee routine.
Gambler's Rehearsal is way too long, but Dan uses it to teach some misdirections and other
basics.
Many of the other tricks have gimmicks with limited use. You might get a spark of
inspiration from them.