Better diffs for the 3905

[Janezki]

I tried to search, but didn't find info about this subject - many threads for the older 3906 though.

So, I'm having a decent BL setup for the new E-Maxx 3905 including LMT 1940-7, MGM ComPro 12018-3 and 8000mAh lipos for 4S, 5S or 6S setup.
I'm looking information/help for upgrading the differentials - something that wouldn't cost a million (200$ max.), don't need major modifications and would be a bit durable than the original diffs.
Links to needed parts/part numbers would be greatly appreciated.