First, EL-AL's program is not by miles but by pointes... and i dont think
it goes somewhere near 50k or more... i think first to nyc is around 4200
points.

As for the seats..., If its the new or the upgrade 777, Then There is
no much difference between F and C seats, Beside the Color (Grey vs Blue)
and the angle (Full bed in F, i think 165 in C - But if you are really tired, you
wont notice the different).

Beside the seats, I think there is a big different in the service, which i will
have to recommend to go on First... 8-)

Since you are doing it with points, i would consider recommending you to
pay additional fee (i think its 50 to 100$) so someone from EL-AL will wait
to you at the gate (after landing in IL) and help you with the exit process
(drive you by car to passport check / pass you thru special passport check
process, Picking up your lugage and so on...)

Thanks,
Eran.