DR Sunbeams. I've now got them on my two jazz basses, one 4 string and one 5 string. My 5er has an Audere preamp and Aguilar Noiseless pickups while the 4 string is still passive- also with Aguilar noiseless. Both basses sound great with the Sunbeams and they seem to have a pretty long life, and still sound good when they're good and broken in.
I've had D'Addario XT's on the 4 string and while inexpensive as bass strings go, the sound was "meh". On the 5 I've also tried DR Pure Blues and D'Addario NYXL's. I think these ones all provided an acceptable sound for they type of music I play (generally all around, from worship to musical theater, some general jamming), but the Sunbeams just seem to be just right.