As others have stated above, this is a very personal choice. My wardrobe is a good mix of high-end & low-end, like almost everything else in my life.
Here is what I splurge on more often:
1) Beautiful leather bags - they make a statement and last a lifetime because they have no fit issues!
2) Watches - again, they last a lifetime. I learned this long ago - if you're wearing a simple tshirt & jeans with a nice hair style, a smart bag and a designer watch, you instantly look classy.
3) Perfumes - I am a Chanel addict. Period.
4) Hair - Not just hair cuts but also hair products. I use only sulfate-free and paraben-free hair products and have to buy everything imported because we don't have any local brands in India who do this. I also spend money on hair spas and deep conditioning treatments.
5) Walking shoes - Need a very comfy pair because of foot problems. I wear off my shoes in 3-4 months tops, so it's not uncommon for me to go through 3 pairs a year.
6) Winter Outerwear - coats & jackets. I simply love winter wear and these also last for years & years. Our winter is not too long, but it can be cold. And we don't have central heating anywhere here....so your jacket/coat makes the look.
7) Bras - not by choice though. I'm not hung up on pretty underpinnings but my size is not available at cheaper brands! Indian brands rarely go over D cup, a couple make an E cup, but no one goes beyond that. As an F cup, I don't have an option at all.
I don't spend too much on other shoes, though I love shoes. I'm very hard on my shoes and seem to have amassed too many. I like other shoes to be mid-range.
I don't like to spend a lot on jeans, somehow. Even low-end jeans seem to last forever! I am more likely to spend extra on a dress than jeans...those are not easy to find! I think what I'm trying to say is that if something is 'hard to fit' for me, I will be willing to spend more to find the 'right' piece.