If you’re considering a 456 and a PA, may I add some confusion by suggesting a Ragley?
I had 2 PAs (mk2 followed by mk1 after I missed it) and have spent a bit of time on a friend’s 456. The PA feels better to me (solid but comfy). Now I’m on a Blue Pig X and it’s distinctly above the others; lots of features combined with a pretty slack HA and versatile head and seat tubes. The more affordable Blue Pig is bound to be similarly splendid or even a Piglet if you don’t need loads of fork. The back end is more compliant than the 456 or PA but yet it feels more stable from the seat tube forward.
I have an adjustable 150mm Rev in the front, had 140 in the PAs. All with droppers and 2×9.
Keep your eyes peeled for a 2nd hand complete (try the wanted section?) or frame only. This counts for whichever you go for as you can get a better spec for your cash.
Nothing wrong with a 456, but some steel is a bit more real.