Thirded<-- is that a word? Haha.
I finally just removed the sand from both of my aquasoil tanks. Looks decent if you have the time and patience to maintain it... otherwise the two will mix together at some point.
The only way I would consider using the combo again would be an island type scape where there is a significant retaining wall between the two.
And for what its worth I wouldn't call any of my "scapes" at this point more than amateur learning tools much less amanoesque. BTW I'm making up all new words all day today.