Turntable info

I checked and your Onkyo does indeed have a built-in phono stage, so you wouldn't have to buy a seperate phono stage unless you wanted to upgrade. Most phono stages in receivers are an afterthought, but you can use it.

What is your budget for a cartridge?

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 !