Looking for a motor for my CRT .5

[Metallover]

Got some stuff sold, need to get some stuff bought. I need a motor for my .5 to run with a mamba max and 2.2 truck gladiators. I had a Medusa 3300 last time around, but I think this time I might go for a Neu. I am debating a 4s setup too.

Would the Neu 1509/2.5d (2700kv) or 1509/1.5y (2400kv) be good for 4s w/ the MM? Or should I just stay at 3s with a mamba max?

I'd like to find a used motor if possible. Let me know if you come across any deals or you have a motor I could use..