I was in the same boat a while back mate. I ended up going for the (back then Autron) Redarc gauge and it is awesome. Looks good, works good, has alarm features which I'm finding very useful, and i don't regret spending $$ on it. However... At the end of the day, a $80 gauge from super cheap could have probably done the job just as good, minus the features.
Half the price? I would have loved to have seen a Autron EGT/boost gauge for sub $320 when it used to be Autron. Are you confusing their EGT/boost gaugse with their other gagues like water/oil which were much cheaper ??