Like you, we needed a car to transport the 3 little people around as soon as we got here; because we only had a 2 year visa, we could only get a loan for 2 years so the repayments were $747/month

. At the start, we had nowt but hassle but- fortunately- it had the warranty. Rented for a couple of weeks which was just shy of $500 before we bought from a dealership and, with hindsight, wish we'd had more time to investigate either before we came over or at least had budgetted to hire a car for a few weeks longer. Here in Adelaide, they can be as cheap as $40/day and you can usually find some cheaper long-term rentals.
On the other hand, we've just bought our 2nd car interstate (via a 'well known site with auctions' !!!!), paid $2000 all up (inc. deliv, rego and licence) and it's bloomin' maaaarvellous!!!
Whichever state/territory you're headed, ask in that forum for reliable, honest dealers.