What types of strings are folks using on their P5's? I was thinking of grabbing some nickel DR Lo-Riders. The previous owner replaced the low B with a crappy unknown string (yellow ball end) and its got little life left to it. I would like to have a 120, but will settle for the .125 the Lo's come with. I think the one on there is a .130 and a lower gauge might tighten up the tone a little bit. The one on there now is flop city, but I can manage.
I use Dean Markley Nickel Plated Blue Steel strings. Pretty much the only round wound I use anymore. I will use nickel DR strings in a pinch. If you order the Markleys from Bassstringsonline, you can specify the B string size.
I will admit I've been thinking about going with Flats on this bass.