Here are things that I find very important, I have a Canon Optura 20, it is a higher end model then the ZR 80
3.5" LCD screen, great for viewing pics and overall shooting, it seems twice as large as a 2.5
I don't take too much action shots so that is not so important to me.
Sledding VideoFirewire for connecting to computer. Even if you do not have a firewire on your computer, you can get a seperate card.
Rca outs are good for connecting to a TV
Remote control is great for viewing video and stills
My stills are 1.3 megapixel (zr80 is half that) To some people stills are not very important but I use both all the time, very handy, check
Here for a 1.3 mp picture I took.
My camera has no built in flash, I had to buy a very expensive Canon one, it claims it is a video light and flash but is pretty useless a light, it is only 3 watts and I am told the big light is 10 watts. Flash part works great.
My Video Camera is very poor in low light but I have yet to see a good one in low light yet, don't shoot in low light is my answer.
SD card for stills is great I bought a 256 meg one and it can hold about 500 pics
The 16x optical zoom is great, digital zoom is useless.