My first high-end purchase was back when I was in my 20's and was a fabulous emerald green and white wool v-neck sweater. I don't remember where it came from but it cost a bundle.
I don't purchase high-end often - maybe once every few years - but my favorite high-end purchase would be my white BCBG blazer that I bought while at the Boston Meet-Up in April 2014. Fond Memories!
My most recent high-end purchase was an emerald (my birthstone) and diamond ring.
I don't really covet anything high-end at the moment. If I see something I really love, I'll save up for it.