thoughts on a replacement car

[ebv8]

i am currently fed up with my VX Commodore.
every week i replace a worn out part and then another part shows signs it need to be replaced.
eg: front shock bent, tail pipe fell off, drive shaft failed, tailshaft centre bearing failed, engine mount failed, trans mount, sway bar links, tie rod ends, and now the steering rack needs to be replaced which i have ordered and will replaced soon.
thats all in 6 months

so i drive everyday under 20km, the car is parked on the street out so no way i'm driving the GT to work and the missus wants a Black wagon (to replace the black VX wagon)
but i want something that can overtake easily as the Commodore is about as slow as I'd ever want a car to be to overtake.

so i was thinking BMW X5 2005 E53 4.4l V8 for about $15k under 150,000km but after realising the price of parts and that its also 10 years old keeping it 5 or so years may cost alot to keep it on the road.

so how about a Mazda CX-7 luxury 2006-2008 model under 150,000km and for about $15k, 2.3t, leather/bose sunroof and all that? lots around so prices are good, plenty of parts around too

not keen on territory as for $15k i can only get a well worn Ghia and although cheap to fix my mate and brother have these and they are not the most reliable car and a bit slow. i'd only consider a 2005 ghia awd or turbo.

i want a wagon thats high off the ground, quick, no older than 2005 and does the old 0-100km in 8 secs or under oh and not a fan of forrester xt's due to maintanance costs