Surefire Sonic Defenders
I don’t use the big muff type hearing protection, just these or the EP4 version (higher NRR rating). Picked my first set up from the Dutch PX in Kandahar in 2008, can now get them in the UK as per link. Unless you’ve been fitted for PIHP, which you haven’t (like me) by the sounds of things, I’d use these rather than spending a fortune on some fancy electronic Amplivox. They’ve protected my hearing fine over the years – range work and on ops firing a variety of firearms, including from inside vehicles (which is particulalry noisy), long journeys by SH and Tac AT and I still pass the hearing test with no issues whatsoever.
Before these I just used to use the yellow foam plugs, but even the current issue brown/yellow Christmas trees are pretty good – they have a small metal insert to help with speech recognition but block high volume noise.
EDIT: And they can be used with a PRR headset no problems or, I’m lead to believe, the harness that would normally fit PIHP…