Really the FS2 is a a very small upgrade on the FS1.
as the FS1 is quite a bit cheaper i would highly recommend going for one before they are all gone.
For the diff balls i have said before and i will say again.
Use the standard balls to begin, you have paid for them so why not use them?
They will be fine for ages ( i used them for 6 months) then when they get noisy just rebuild your diffs with Carbide balls ( i always use the kyosho ones as i know they work well), they dont wear the diff plates like ceramic balls do. I have never had to rebuild a diff on a car since i been doing this way for last 5 years.
I do rebuild occasionly but i dont have too
but i do like to race on a budget
