The Panasonic DMC-FZ2 (if you can get it) adds some manual controls to the DMC-FZ1. The upcoming DMC-FZ10 looks to be a better camera but it has an MSRP of $600 (although some outfits let you preorder for $550).
Another option is looking on ebay
for another UZI.
The next price tier for a stabilized long reach is the 300D with Canon's IS 75-300 lens for over $1300.