Hi John
been down the smoke this last week so just catching up with these posts ...
I own the same set up as Billy (but wish I had Tom' s knowledge
The Z5 is an awesome piece of kit and capable of many wondrous things ! (with th help of the 'seeing eye' of course !!)
no sooner do you think you have bottomed a trick on it, it comes up with something more !!
an excellent piece but now being superceded .. as Tom said the NX5 for one.... but if you you can pick a Z5 at a good price you will be handsomely rewarded!
it is a bit of a beast to lug around, but for whipping out as the opportunity presents itself (ooooeerrrr matron) I always have to hand the JVC everio gzhm200 1920x 1080 avchd format which is excellent in good light but absolutely carp in low light situations...
there's tons of stuff on Tinternet to read before you buy
of course the IAC forum just being one ... ahem......