looks good to me. and like you said, if you need more you can always run the line out to the pa and the amp can be your stage monitor. its fairly common to see that done
This generation of Rumble amps is awesome. I've got one as well, it sounds great and as a bonus it's oddly light. Even the drive circuit sounds pretty good and you can have a legitimate clean and slightly distorted 2 channel bass amp. The EQ points are good and the tone modifier buttons work well too. FYI, if you need more volume, adding an extension cab will up the power to the full 200W. (That's the only drawback, it's called a 200W amp but only outputs 140W as a standalone combo).
I almost bought the low wattage version - I really liked the OD sound.
I don't care much for the OD. I stick to the clean channel. I'm planning to get an OD pedal though. Ampeg Scrambler Bass OD looks like it's got the goods. I especially like the mix knob so you can retain the low end by mixing some clean signal back into the dirty sound.