Turntables

I looked at a picture of your receiver and it shows a phono input on the back. It will need to be a moving magnet or a high output moving coil design, for it to work with your Onkyo.

If I may ask - why do you only consider Pro-ject turntable?
Any $100 MM would do, I wouldn't buy $800-$1000 cartridge at this point unless you intend to get phono stage soon.

I agree with Inna..

While the Perspex 6 is a fine table with a tonearm capable of a $800-$1000 cartridge, I agree with the others and stick with a $100-$150 entry level MM cartridge at this time. Biggest reason being your electronics - your using the on-board phono stage in an AVR; electronics not exactly known for their analog performance. You would never get the most of a higher dollar cartridge.

Also, the Perspex's 9CC EVO tone arm is very low mass at only 8 grams so it should be matched with a high compliance cartridge. Ortofons and Sumikos come to mind. You might want to start with an Ortofon 2M Red at $99. You can upgrade the cartridge to three higher levels by changing the stylus, all the way up to the 2M Black at $750 that's sports a Shibata stylus. That is of course once you get away from the AVR.