My 2c... Buy the house first, pay a chunk of mortgage off, then chuck your car purchase on your mortgage and enjoy the low rates. You won't even notice this dent in your wallet if you do it this way.
This is how my s14 was bought back in 2002, when I was 21, just added to parents mortgage and paid off overtime (28k back then!)
I've had my share of crappy dailys over the years and there comes a time when you just get over sitting in an old pile of crap like a 17yo p-plater. All depends on what you how you define a daily anyway. Is it a beater to leave at a dodgy train station all day? Or a decent car to use generally? This will determine of 30k is worth spending. My current daily is somewhere halfway, a 12k v35, perfect compromise for my needs