The concept will most likely not be a major upgrade from the p2. I most def recommend used tt. But be carful - you will want one that has no fuss after it's set up properly since you'll be baking. Maybe a dealer demo? In your price range are the vpi classic and well tempered. I have heard both (not in the same system) and think the wt may be a better sound. I am considering one myself if I don't go down the idler vintage path. That will leave room for a good phono amp and cartridge. If the nad has a MC phono - spend your money on the best tt and cart if you plan to upgrade. If you have not tweaked out the p2 yet (brass footers/maple platform or equivalent) save money and do that - it may make a big difference - then spend money on a great phono and cart.
Cheers!
Cheers!