"Don't forget the Ricoh GXR system. The newer lens units use APS sensors and the quality is extremely high. It even has an M-mount lens unit designed to use Leica, Voigtlander, and other M-mount legacy lenses, and the sensor has very high dynamic range and beautiful resolution. Many people are calling it the poor-man's Leica.
I've moved on to the Oylmpus OM-D E-M5, mainly because I found the GXR's lens units difficult to make work as a single, integrated system, plus I wanted a much faster focusing camera, since I take lots of wildlife and people photos. However, I still very much prefer the Ricoh camera interface and love the colors and rendition of the Ricoh APS sensors."
I've upgraded from a Ricoh GX200 (24-72 zoom) to a Ricoh GXR. Not UL, but good IQ. The thing is I want DSLR quality and superzoom capability. The GXR lens/sensor units make it possible to have both in one kit at a reasonable weight. The A12 28mm f2.5 unit uses a full APS-C sized Sony sensor and weighs 210g, the P10 28-280mm 10 x optical zoom unit uses a much smaller sensor and weighs a mere 171g. The camera, battery and card weighs 210g. So for a total of 591g or just shy of 21oz you have DSLR image quality for landscapes and portraits/group photos, and the ability to pluck birds on the wing and bring distant crags or canoes close up.
This is more than some will carry, but a lot less than the OP, with more versatility. And after all, the kit only weighs about the same as a pint of water. OK, the P10 unit only gives around the same image quality as a Pana TZ20, but the 28mm f2.5 APS-C has some serious low light ability and high IQ for close work, groups and panoramas.
I'll see how it goes.