I tried Security Spy and Evocam and found it a difficult choice.
I went with Evocam, which I've used for more than a year. It had a recent improvement to its server that allows viewing images on an iPhone.
The documentation is not great, but the support is "nice" as mentioned above.
Evocam monitors 5 cameras for us. Two panasonics, two Sharx, and a Trendnet. Primarily it allows for web viewing and time lapse recording. It has been stable.