tonearm + cartridge for custom lenco 75

Hey Analog lovers...
need your advise for nice tonearm and cartridge .
I bought a Lenco 75 (PTP4) + heavy plinth ,
which design to have 2 arms 9" and 12".

as understand ,good 12" long tonearms usually better then 9" arms in same price range .
especially for the Lenco 75.

so need your advise for a nice 12" tonearm and nice MC cartridge .
unless you think there's some nice 9" who could do the work.
my budget is 1200$ max for them both.
lower is better , would prefer to spend 800$ if the difference is not meaningful

12" options:

SAEC 308L
JELCO 750L (many says it good tonearm but it isn't true hi end arm).

9" :
Fidelity research 24
Saec 308N
SAEC 317

cartridge :
Denon 103R, AT 33 or OC9

Speakers:
Jbl L300
Amplifier:
SET 845 monoblocks
Pone stage: customize based on Tamura TKS 83 transformess