I think it is past time for a Greek, aligned, complete, and fully functional edition of the Aland Synopsis Quattuor Evangeliorum.
"Greek" - enough said.
"Aligned" - with the parallels aligned spatially, rather than "run-on" in the columns as in the current version of the Aland Synopsis. (The Burton - Goodspeed Harmony could be set to aligned Greek back in Logos 4 or 5. But alas! That capability has been taken away and I know not where it has been laid.)
"Complete" - with all the marginal notes and front matter from the most recent German Bible Society print edition.
"Fully functional" - in the Logos standard, including the ability to highlight parallels in the various columns.