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1000 is lacking battery capacity, as for actually using it I have no idea. I've only had lots of experience with the 800. The 810 is meant to be better according to @skinny. I'd probably buy an 810 if I was buying now. Some people get away with navigating on the 500 but I'd get lost to easily to run without maps.
I just had the base thing and then bought maps, but I've also used it with free OSM maps and they've worked quite well too.
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The 200 is better for audax. The battery lasts way longer than an 800 or 810 and it doesn't have the bug which makes it freeze/crash at 250-300km and be as much use as a chocolate teapot thereafter (grr).
The navigation isn't as advanced because it doesn't do turn by turn or whatever it's called but you can follow a route on it fine.
It's smaller and lighter than an 800/810 and it currently costs £79.99 on Wiggle.
Interestingly/uninterestingly I have noticed Steve Abraham is using a 1000. He's clearly got a way of topping the power up but it doesn't seem to suffer from the 800 bug judging by his Strava.
800 or 1000 do you think?
and do I need the "Navigation Bundle" in order for it to be useful to me?