Aquila ambra 900
These are one of my favorite string sets. The sonority of the bass strings compliments the trebles beautifully. They have a " darker" sound than most modern strings. I have not had breakage issues with these- I've used several sets. The one thing misleading about these is the description. They are most definitely meant to be tuned to 440hz. I emailed aquila, and the owner wrote me back and told me he personally designed them for standard tuning. It's the true gut strings that aren't meant for standard tuning. 440hz for the 800 set as well.
On 55C Aquila Ambra 900 Classical Guitar Strings 55C, Full Set