I don't think you will go far wrong with either an LRP or Nosram speedo (got both now, both seem great but then again they are the same unit!!)
As for motors I was told Novak was the most reliable so that is what I went for. Orion / Peak seem a good bet too.
As for motor spec 5.5 seems the most popular in the UK for 4wd but I'd maybe go for a 6.5 if your running on a loose dirt track (which I assume, probably incorrectly, you will be in that part of the world)
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