I would go for a R10.1 or used R10, same setup card as your 2wd, easier to manage 2 cars with the same ESC plus 4wd can be hard on those.
You will keep it for a while, resell value is good and can be a spare for the 2wd.
And I'm not running Orion electronics (Orca) but quality is good and very reliable.
A good 6.5 will be enough and easier to run.
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