I have been reading reviews, and watching videos on cameras, and am still stumped. I need a camera for less than $325.00 Need help find a camera that will give me some good video. Right now I have an old Kodak Easyshare C713 7.0mp 3X Optical zoom.

We get deer in the field behine the trailer, and I want to get some good video of them, well better than what I can with this camera.
Here is a video I made with this camera. Then I edited it with powerdirector 8. My video was filmed at 320X240 I think, and uploaded to youtube.

http://www.youtube.com/user/NCDigger1#p/u/0/T5NV0kuzsTE

I was filming the deer, they was between 75, and 125 yards out.
How much optical zoom would I need to reach out to lets say 250 yards to be safe? Or at about the distance those deer was out?
I was wanting to get the a Canon powershot sc20 is, it has 20X and 12mp. But it's at my maximum budget. Could I get good video with a lesser model?
The reason I'm not considering a camcorder is I metal detect, and rather have a camera, with good photo abilitys. I want the canon sx20is, they have it referbished for $327.00 on fee bay, but not sure what to do. This is taxing my budget, and I'm wandering if I can get buy with anything less than the sx20is. But a lot better than my 7.0mp 3X.

Please help me Thanks