I always used the (almost) cheapest roundwound strings i could find, until I decided to try out some flatwounds. After some research I found La Bella as a popular brand, and decided to try them out - despite the price being pretty high, at least to me.
I never had a bass sound as good, and couldn't imagine going back to other strings. Hopefully the set will last years, in which case the price isn't really an issue.
Definately recommendable. Make sure to check out the sheet on string length though, to make sure the strings you get are suitable for the bass in question.