So, my current plan is to go Axe-> some SS poweramp (rocktron 300?)-> some passive FRFR speaker cab.
Suggestions on an inexpensive and hopefully lightweight cab/FRFR thingy.
I don't know what the definition of inexpensive is, but people love the passive Atomic cabs (same as the actives, sans the 50W 6L6 tube power section). They're fairly flat but I think have a bass response tailored to the guitarist's general domain, i.e. they start rolling off somewhere around 60 Hz in my estimation.
They're lightweight, and the only FRFR kit that I recognize actually looks like guitar gear. Otherwise you're going to hit up the Pro Audio section of a catalog and find yourself a wedge or upright speaker within your budget.