The only thing that i would consider a viable upgrade for the working DJ, is that the 260 has peakstopplus, it is a true brick wall limiter. While the PA only has PeakStop limiter - it still lets transients through.
Other than that, the PA is the logical choice for the DJ. It has front input RTA jacks... the 260 has it on the back. Also, the power button is in front. IN short, the PA was designed more for mobile work, while the 260 is designed more for installations.
And you dont need stuff like full routing capabilities, and computer controlled interface.
1) Availability of true room delay (vs. just driver alignment delay). Haven't needed delay yet, but I've been getting into bigger stuff, so sooner or later I probably will.
2) Computer GUI. The 260 supports it, the PA doesn't. I find it much easier to setup and control the DR through the GUI than through the front panel (about the only things I do through the front panel is mute/unmute, program select and load, auto eq, and auto feedback setup). I also like that I can save the settings from the DR to the computer. It saved my butt a couple of times where the DR inexplicably powered up with a checksum error and reset to factory settings.
I keep a 100' XLR cord plugged into the RTA jack and just leave it coiled in the back of my rack. I uncoil it only when I EQ. So having the jack on the back instead of the front isn't a problem.
As to the power switch in the back, I just leave it on. The DR powers up when I turn the voltage regulator on.