The best pivot balls?

[Zeta Phoenix]

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