Question for you Jabba - is all the stuff in your a/c TSO'd?
Dextas has to be. I have the same stuff as him/her in my Archer. Texta is right on the money cost wise.
And as for 'smarter' options, check out the latest list of ápproved' installations.
No doubt cheaper stuff will eventuate, but because of the Aussie quango penchant for being first out of the box, we will probably have to drop back to VFR until that stuff becomes affordable compared to the value of the airframes.
The yanks are talking about portable stuff being approved before their 2021 deadline.