Assuing the Nosram esc is their version of the sphere that sounds fine. Most people find 4.5 a bit much though, I think 5.5 is most popular in 4wd?
The orions are fine, good cells, not the highest capacity but a lot of top guys use them.
I've always liked futaba servo's so that will be fine
Never used KO, but Esprit 3 is meant to be top of the range I think?
Receiver, well for ease probably spektrum modules, no crystals to worry about!!
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