i somewhat agree with that. I am sure you are aware that you can obtain an IR on your PPL. If you have your PPL already, why not do it? However, what you learn (experience wise) on your CPL cross country flights is priceless.. trust me!!!
I would recommend gaining the CPL first, however as the person above said, think about taking the irex exam now. It is extremely hard, so start studying!!! Then get your CPL and start doing some sim work!
good luck