The Rega P5 is a better deck than the P3-24. However, I think the P3-24 with the TTPSU sounds a good bit better than a bare P5. I've heard both side by side a few times.
Just throwing that out there as I see closeouts for the P3-24 with TTPSU at places like Music Direct. If the P5 isn't around anymore, this may be a great alternative.