If you decide on the Rega P10, most certainly get the Aphelion.
Rega is for someone who wants a "high enough" performance with plug and play convenience. I say "high enough" because upper level setups require a certain amount of obsession and neurosis to strive for "absolute sound." Rega+Rega cart requires no alignment jigs-3 screws and you're done, ready to play.
Just make certain you spend an good amount on the phono stage to allow it sound it's best. Get the SME or whatever after you've also upgraded the rest of the system to support the "next level" turntable