I just put a fresh set of Ernie Ball Regular Slinky (45 - 130) strings on my Euro 5LX, and they sound fantastic, although I did encounter a problem. The ball-end wrap is not tapered on these strings and the low B string did not want to sit well in the bridge due to being too large. I ended up flattening the wrap out a bit with a vice grips and that seemed to solve the problem, but I was curious if anyone else has encountered this problem with any other strings. I've been toying with the idea of using some of the light gauge strings Fodera produces since I'm rarely utilizing the low B string at this time. You could take a look at their selection of strings and see if any of those appeal to you. I, personally, want to try these strings out just to see if tuning a 5-string bass to a standard 4 string tuning with a high C would work better for some of the projects I'm working with.