Hello Randi. :)
The best incense for deep meditation differs between people, their individual preferences, and their practice.
Certain forms of meditation may dictate what type of incense traditionally used but in the case such details are not provide you could always go with some easy to find incense made with herbs with specific magic properties use for the purpose of the meditation itself.
For protection you could try aloe, amaranth, lavender, dogwood, carnation, or something like pine.