I've used DR strings for years, mostly Fat Beams and SunBeams with a .125 B. I like the 100-80-60-40 set for the E-A-D-G, but the .120 is just too light and loose for a B. More recently, I've tried the Neons and Dragon Skins, but the fatter strings sound dead pretty quickly.
I just received a set of Elixirs to review with a .135 B and I'm liking them. They don't feel that different from the DR .125 in thickness, so I wonder how accurate the gauges are between brands. They feel plenty tight and sound good, so I'm happy with them. They sent me a second set with a .130 B, and I'll give them a try when these start to die.