I am building a GorillaMaxx G3r chassis using RPM arms. I am wondering what are the best Pivot balls to run. I am attempting to build as light (but still keep the wallet heavy

).
So far I have:
Traxxas Aluminum Pivot balls
Lunsford Titanium
UE Supermaxx Titanium
I need 6 Pivot balls as I am using the RPM Tru-Track rear arms; but everyone seems to sell in 4's or 8's

.
I am looking at peoples opinions on which will be best for a basher truck that will still be light weight.
Thanks,
-Jon