I agree with salmonac. The Addi circulars are my favorite "high quality" choice.
She's right, there are a lot of high quality choices, but I'd recommend Addi for two main reasons: 1) quality 2) reasonable price.
When I say "reasonable price", I mean "relatively". They're much spendier than cheap needles, but they're reasonable compared to, let's say Signature Arts needles which I also own.
Addi is the needle I use the most. I have both regular tips, and the pointy "lace" tips.
However, today I'm using my US 5/3.75mm stiletto tips Signature Arts circular, and they're making my work on a Gridwork lace scarf a breeze!
If you have the budget available, and the inclination to own the best of the best, having Addis and Signature Arts circulars is a real treat.