@ V  you say "But sunflower oil is kind of an odd thing to use in Bulgarian cooking, if you want to be traditional about it "  ..now i am very confused because ever since I was young I remember eating meals prepared with sunflower oil....or maybe I am mistaking, but up until I was 10 I didn't know any other kind existed...then of course I was told you can make oil out of other things as well..like olives xD And nowadays my parents use both sunflower and olive oil....but maybe it differs depending on the region.

When it comes to brands I think it all depends on money. Back in Bulgaria I used to look for the more expensive and more popular ones but here in Germany I feel like an alien in the supermarket....and well...I buy whatever is the cheapest 'cause I'm a poor student :D
But I am a fan of diversity, I would recommed trying out different things as well (though in Bulgaria you have to be careful...you never know what you're going to get ;) )

And good luck with the cooking this month! I am regularly following the blog, it's great! ^_^