Pretty much nailed it there,
The mid altitude map is the best map for all altitudes up to 12,000... and the wiring upgrades are still not decided by many. I did them on my 1000 and there was no change what so ever. Also clutching from the factory is horrible, so add a clutch kit to the list of mods.
The 1000 is not for everyone, they do need a couple simple updates done to make them run good and remain reliable. But they are heavy, there are lots of ways to drop weight but in the end you'll have to spend some money.
Once setup they pull WAY harder than the 800's , but without big coin they are still heavier and getting them to out pull an 800 consistantly will require as much cost as a used well set up 800. If I only rode above the tree line I would choose my 1000 over the others, but it's a pretty one sided sword. The 800 has less power but will be a more fun sled in the long run ...for most people.