Rega P3 plus upgrades equal Sota Saphire minus the suspension.
P3- 24 motor upgrade + incognito tone arm wire + Deluxe Groove tracer subplatter + Heavy Weight for tonearm + Iron Audio Acrylic Platter = Sota Saphire, and this is according to someone who owns both tables.
Only you can decide whether or not it's worth it.
Enjoy the music.