Having flown all of the A2A GA aircraft as well as the Realair Duke V2 and Legacy, I've recently picked up a few cheaper aircraft from IRIS (Texan Driver, Grob 115E and Battlefield Airlifter) and (Lionheart) Quest Kodiak. It really is apparent just *how* high they (A2A and Realair) have raised the bar. These other aircraft though very competent, and a
lot cheaper in the sales, are lacking crispness and detail in their texturing and modelling, their sounds are lacking in realism and subtleties , their flight models feel weaker and their documentation isn't in the same league either.
I agree that A2A or Realair would be great additions - though sadly you've juust missed the A2A 25% off sale (and the < half price Kodiak).
That's not to say the likes of the Quest Kodiak isn't a lot of fun... there aren't all that many aircraft that could get in here (Milie PNG, part of ORBX Jacksons International) and back out again. Yes, that's a very(!) steep uphill strip with a kink in the middle and houses at the end:

Now that was fun!