If you were to get a high-end camcorder and you wanted to display the video in high resolution, it would take (a) more storage on the web server, because high end video takes more space and (b) it would take more bandwidth to download/stream. So, if then get a high-end and have to convert the video to web quality (which is recommended), you don't really need a high-end.
I wouldn't go out and buy the cheapest, but something in mid-range should do fine. It also depends on where you take the video... inside, outside, low light, etc. So I would do some research on camcorders that fit your environment for filming, then later the video files can be converted to be played on the web.
I hope to be building a website soon and will need to post several videos on it explaining how to use my product. I want to purchase a camcorder to get started, but don't know what to get? Do I need high-end to post a video? Or is that not needed for a web video? I realize I may be putting the cart before the horse, but because of the nature of my product, I cannot wait to make the video until after my site is up and running. Any advice on which type of camcorder and the necessary features would be greatly appreciated.