I think I'm like the Anti-Brand Whore or something when it comes to food...I always buy whatever's cheapest, even if I could get something nicer for a few more bucks. I don't really cook, and I don't loveeating like some people do, it's just something I have to do to stay alive--so it doesn't really bother me if it's not that great an experience.
As far as clothes go, I haven't really been shopping much in Sydney, but I buy what I like the look of. Back in Melbourne I used to buy all my shirts, jeans etc from op-shops, Target etc, and then go and spend a couple of hundred on a jacket from Ministry of Style in Brunswick Street just cause it had a million pockets (I'm a big pockets fan). So I'm not really a brand whore, but will shell out big bucks for something I like the look of.
Other than that...I don't really buy furniture/electrical equipment/etc. just wait for someone to give me something as a present or else go dumpster-diving every now and then...