First post in is already of the, "I never use suspicious props," school. Impressive.
That said, the deck really isn't going to enhance your performance in the slightest without motivation. I like to use Ghosts because they're durable and the monochromatic color scheme works well with my wardrobe. So it's mostly a stylistic choice on my part. For real motivation, that requires some creativity on your part. You need to be able to answer any question with a reasonable reply.
That said, be aware that custom decks are more expensive. Use them if you can afford the expense, but don't feel like you should have to.
As for the whole idea that everyone will automatically think it's a trick deck, I think that's bull****. Some people have the sort of style that makes custom decks work, others don't. Nothing wrong with either way, but you have to find out for yourself what works and what doesn't for you personally.