You'll likely need a high-output cartridge. Most receivers with phono stages are designed for the higher output of a moving magnet cartridge and the 47k input loading. I didn't look at your Onkyo's specs but you'll probably be okay with a cartridge that outputs 3 mV or more. Stick with a MM or moving iron (e.g., Grado or SoundSmith) cartridge for maximum bang for the buck.
If you decide to go with a high-output moving coil cartridge, be aware that sometimes (dependent on the specific cartridge) the lack of input loading adjustment capability on a receiver *may* cause a MC cartridge to sound "peaky" (harsh, strident, excessive high frequency response).
Have fun and welcome to world of vinyl !