EagleEyez-
The book is really the best place to start.
On the many Joe Gibbs old and new, I've found they are variable quality pressings like most reggae. They have access to an incredible catalog though worth a punt if you like the tracks. Got some nice new 10" releases that I picked up from Universal Roots in the arcade in Brixton, they are really friendly and will give advice and recommendations. Not sure if they are still there after lockdown. I hope so although I know he was considering stopping before the pandemic.
If you want great pressings then check out the label Dub Store Records from Japan. They press some fantastic reissues. You can probably buy them over the internet without too many worries about quality, they don't always have the biggest titles though.
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Airhead
VPRL 4212 Congos - Heart Of The Congos
Bunny Wailer - Blackheart Man (I've got a first pressing but there must be modern pressing available)
All of the albums discussed on the last 2 pages would be in my top twenty for dub.
Also read the book I mentioned, it's full of very good recommendations.
Good luck finding really good copies of the top twenty dub records in Brixton though. That would just be too easy :) Don't be put off of the VG/VG stuff though, affordable VG/VG pressings are available and they can still be enjoyed.