SteelyDan:
$65 is what a local audiologist charged me a couple of years ago. That included fitting and one set of silicone rubber plugs. I use them often and they are holding up very well. By the way I believe they are at least equivalent to a NRR 30-35 muff and they are not compromised by hats and glasses.
It's what comes to mind when I hear "Best" and "Ear Protection". I've got my eye on the mid-range product - might take a bit before the CFO is convinced of the need.
Gun Tests had great things to say about the Peltors. I don't think they get any better.
One thing I picked up from the acoustic doors we deal with at work is that STC / dbA scales are logarithmic. The attenuation of an STC 55 door is actually double that of an STC 50 - not a 10% increase that I would have guessed.
I'm not sure how that relates to the NRR ratings on muffs but I'd guess it's similar - if so, I wouldn't be surprised to see pricing differences apparantly out of context with dbA increases.
The "rule of thumb" I got from Riverbank Acoustical is a straightforward "bump" of 5dbA for tandem mounting of 2 similar assemblies.
stc 30 plugs + stc 30 muffs should = total performance of stc 35.
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