Wow congrats!!!
If you don't want a mumbus, you might have to look at a station wagon... that would be your best bet with regards to boot space. How much are you wanting to spend?
What about a Honda Stream. It's a 7 seater BUT it looks like a station wagon.
Here's one I found on TM:
Stream
Otherwise look at something like a Territory, Caldina, Mazda 6/Atenza, Holden?