Never used Bohler rods. Heard they're good though. 5p+ is basically the same as the 'ol brick red, but runs in either DC polarity & is a little more stable, or so they say. It's a great rod, you just won't get the pretty welds like a LO-HI rod is going to produce.
Good luck! I'm sure you'll be happy with 5p+. Lincoln's 7018 Excalibur is excellent as well. :-) Steve.