I would be leery of kenrockwell's opinions on this. While I mostly like his factual reviews of certain things, this seems to be extremely biased towards the 600, and if you read his other pages, the 400. The 800 is a true workhorse, in that it will give you just about anything you'd need whenever you need it. He downplays the lack of an external battery pack connector for the 600, but there are things that you might need the quick refresh for; it's tough to say since you didn't provide any insight into what you shoot. If you're doing sports, either for pay or fun, it'd suck to miss a great shot because your flash didn't recycle fast enough. Also, for things like the "Idiotic repeating strobe mode," they may seem superfluous when you've never used them before, and you probably will only use them 1 out of every 1000 times you use the flash, but there are some really neat things you can do with them.
That being said, if you're here and asking about flashes, you probably aren't going to be running one into the ground very quickly, so if you can swing it, you might as well get an 800 and have it forever. If you _know_ you're never going to use it for more than standard strobe duty/don't have the money/are planning on getting more than one for remotes, I think you'd be safe with the 600