If you can get it, I'd recommend the Golden Section Tour / Omnidelic Exotour
digipac as the start point.
Ostensibly a double live album set, disc one is various performances from the 1983 tour that accompanied the release of the Golden Section.
Disc two is an apparently 'live' album - though no audience reactions or acoustics can be heard - featuring JF and Louis Gordon from 1997. The album incorporates vintage Ultravox, solo-JF and - at the time - newer songs from the JF & LG collaborations.
Never far from the top-played stuff in my iPod