It depends on how much you want to spend and what the purpose is for but i run 5 of these listed below at different locations including one at my residence. I get approx 4-6 days of 24/hr recording with 8 cameras attached.
http://www.jaycar.com.au/productView...T&SUBCATID=451
I have had multiple smaller, discreet cameras vandalised and/or stolen whereas a big chunky 'in your face' camera is far more valuable as a deterrant as it shows you mean business. As soon as the big cameras went up almost all incidents ceased.
It's not cheap, but usually trying to catch someone after the fact is a lot harder than deterring them in the first place - especially when lower image quality cameras are used.
cheers