REGA: How to resolve a P5 vs RP6 purchasing dilemma?

Basically, I've decided to buy a Rega turntable and am torn between purchasing a new RP6 and a (slightly) used P5 being sold online by an authorized Rega dealer. The P5 can be had for $850 or $1,100 including the power supply unit upgrade. The turntable already has upgraded interconnects, Cardas solid core OFC I'm told. A brand new RP6 would be $1495, also including the PSU.

If anyone wants to know my current setup (hoping to upgrade in the somewhat near future) is a Rotel RQ-9708BX phono stage, a Harman Kardon HK 3480 stereo receiver and a pair of Kef Coda 9.2 loudspeakers, or alternately a Little Dot i+ headphone amp with Philips ECG 6028 tubes and some Grado SR225i headphones. Also, I'm planning on putting a Dynavector 10x5 on the new turntable.

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