Just out of curiosity what type of car are you looking at? I.e. Van, mini van, suv or 4wd?

4wd (I know most about these)

We have a 7 seater Nissan Patrol, which I love, but I know they are too big for some people.
My parents have a Toyota Landcruiser 80 series which is also great. We fit 5 adults easily in my older model Patrol and the later models (GU from 2004) can have 4 baby seat bolts (2 in middle, 2 in third row) and fit 7 adults.
The 80 series (from 1997) fits 7 adults and also have 4 baby seat bolts.
There is also the Mitsubishi Pajero, but I think the leg room tends to be a bit small in the rear seats.

SUV
I have friends who have the Ford territory and while the kids are young they are finding it great, but when putting adults in the rear seats the leg room was a bit cramped.
I've also had people recommend the Nissan Pathfinder

Mini Vans
Several other friends of mine have recently bought mini vans.
One bought a Mazda CX7, the other bought a Mitsubishi (can't remember the name) both have found these cars to be a great investment, but as they only have small kids in them I can't really say how you would go with adults.

Vans
Mitsubishi Delicia- haven't driven one myself, but my brother (who is a mechanic) has and was looking at one for himself.
Tarago- well you as you've had one I need not say more
Nissan Nomad- not all that different to the Toyota Tarago



With any people mover I would advise buying one with the diesel engine as not only is fuel cheaper but the diesel motor is made for taking more weight easily (motor tends to last longer with good care)


Rough guide of prices- all depends where you are and how good condition the car is.

Nissan Patrol GU diesel (get the 4.2 if you can, if not don't buy a 3lt that was made before 2004 as they have lots of issues) looking at anywhere between $15 - $20K for a good 2001-2004, or $20-$40K for more recent model

Landcruiser 80 series (1995-1999) $8-$15K for a diesel (once again best motor is 4.2 diesel)
Landcruiser 100series (2000- 2007) $20K+ diesel
Landcruiser 200 series (2008- current) current model so $50K+

Sorry but I don't really know the price ranges of the other cars. .
You can look it up on "Red Book" (that's where the insurance brokers get their Market value quotes from)

Also companies like RAA and NRMA also do car reviews, you can check their website or ring them to ask about what Make/Model would suit you best.

As you can tell I'm a bit of a 4wd car nut.
Best of luck with you car hunting!