Hi Colhogan,
First thing, what do feel your current setup lacks in terms of overall music enjoyment.
The Rega P3/24 RB301 would be a nice upgrade from the P1/RB200 but with a newer cartridge, one of Regas own or a high-out put MC.
Your speakers may be fine, as one reviewer said on the R1’s
“Not surprisingly given Rega’s strong turntable background, the R1’s really shine with LP playback, creating that deep sense of rhythmic and musical flow that is the LP’s forte.”
If you’re lacking punch maybe add a sub but it’s impossible to say without more input. The .5 is still a very good pre-amp but Bryton have made appreciable gains with the 3Bs over the years.
Is your sound, flat, lacking dynamics, shrill, not enough base, soundstage, depth, detail, or lacks that touch of realism or musical involvement, just some questions?
Robert