Ok, guys ....slow down!!
You're dealing with an old fart, ok?
Just let me read that again...S L O W L Y !!
For the start...1600 bux is just out of the question.
We could run the forum on that for 5 years!
Distortion coming at the extreme end makes sense....that'd be in the 15mm range (full frame).
While attractive for the odd shot, it's something I don't really need.
What I DO use (and want) is a mostly distortion free max-zoom at the (300) 600mm end.
I also want better low-light shots without the graininess, preferably up to a medium zoom-setting!
Then add some ruggedness re: moisture and DUST!
(which I found a bit of an issue with the FZ100/ mesh-jackets/ having the cam dangling in the breeze around my neck while touring..., it's had 3 "commercial cleans" through camera-shops thus far).
It's also gotta be a practical thing, a P+S jobbie without the need for extra lenses.... if at all possible. It's the workhorse, no the show-stopper.
Data-transfer onto an appropriate memory-card also has to be FAST!
The 100 is too slow and hasn't got enough buffer-Ram for continuous shooting (6shots/sec at full res and AF...which really drops down to 3-4 shots/ sec due to the slow data-transfer, despite the latest firmware and fast media).