Norinco TT in 9mm? It's ok in original 7.62x25TT due to low ammo cost and fun factor.
I would skip 9mm in TT, I had 2 of them, it's not accurate at all and after 1000 rounds becomes very unreliable, due to crappy springs and added safety lever.
I can not comment on NP20, I never handle one, but I would agree on getting extra $100 and getting Sig based NP-34 pistol.
If you have urge to buy something inexpensive to shoot, just go for $150 Norinco M93 Sportsman for now. It's not 9mm but .22LR.. Save more and then get something later descent in 9mm