I hear really nice things said about the Phil Jones stuff. No firsthand experience with it here. *See, Jazzy beat me to it!
It's pretty hard to foul up a Series bass. It could be as simple as a
really good set of headphones or iems. If you just gotta' hear it coming from a box, whew... golly, where to start?
Me personally, I really like the Acoustic Image stuff. It's small, versatile, can run 2 ohms and power a pair of cabs if I needed to, but is fine and dandy with a Bag End S10-D for practice or low volume acoustic jams.
Congratulations on your new-to-you Series II. If that's the one I think it is, I'm glad to hear someone will finally play it and appreciate it.