Hello davebarr98! First off I would just like to say good luck with your talent show and thank you for representing the performing art of magic at the venue.
As far as stage magic goes, I try not to do anything that really falls under the brand of "cardistry". Not that there is anything wrong with cardistry, but if you set up a plot such as an oil and water effect, it might bore the audience because you are explaining the "set up" to them as you go along if that makes sense. So what I try to do is go for a more "organic" kind of feel for stage magic. Stuff that is done with cards that seem practically impossible without an audience member thinking that maybe it was all in the fancy shuffles and sleight of hand.
Card to shoe will definitely fit the bill on that because I would classify that as organic magic because a selected card that seemingly gets transported to a shoe that you have been wearing the entire time is pretty amazing and not something an audience member would think is all done with a rigged deck or anything like that. The Invisible Deck is pretty good as well because it's easy and an audience member can't accuse it of just being sleight of hand. I'm a fan of rising decks as well as performing the Haunted Deck trick with either loops or an ITR.
Outside of those recommendations, I believe your key to a successful performance will be in on how entertaining you and not really what effect you are using. You can go with my suggestions or not, but in the end it will all be about how you are as a performer. The trick I have discovered to getting an audience to like me is having the audience included in as many effects as possible. It allows me to communicate more naturally and have more fun thus the audience is having more fun. Once again, best of luck to you!