From another site.. what expensive items are actually worth every single penny that they cost? I'll throw in 2 examples right off the bat that are applicable to me.

1) Mattress. I've found that buying a quality mattress helps me get to sleep faster, stay asleep, and makes me feel refreshed in the morning. It also has helped my back problems and reduces snoring considerably. Along with this, good pillows, and good sheet sets. I will never go back. Source: Serta iComfort Prodigy - approx $2500 (king size). We tried several different brands (OMF, S&F, Sealy, etc) and models and came back to this. It also helps to have a layer of latex cooling gel, as I sleep hot. Not one complaint.

2) Boots. I spent more time in my boots than I do any other shoe. It is imperative to find something that balances comfort and function. I am in these between 12-24 hours at a time. I was satisfied with my 5.11 ATAC boots, but next time I might try a pair of Haix. Also helps with back problems.