P2 or P3

Hello

I am getting back into vynil and wondering what table would be a better way to go, the Rega P2 or P3? I know that stock the P3 is better, but would the P2 with a glass platter and heavyweight upgrade sound better than a P3 with heavywieght for less money?

I have read and much debate about about which arm is better teh 250 or 300.
Is the only other difference between these tables that platter?

Also what about cartridges? I am considering the Goldring 1042 and Shure V15. Any thoughts on these in regards to the Rega tables. I would look at the Grado's but they have the hum issue.

Any comments would be helpful.
My other equipment is:
Rega Planet 2000 CD player
Linn Pretek preamp with phono stage
Bryston 3B power amp
Paradigm Reference Studio 40's v.2

Thanks.