I think they said the combined pricing of the parts is something like $650? So yeah, 800 is already pretty hopeful to be honest.
If they price it at say 800 vs 1000 vs 1200 the sales will probably drop by 25-40% each time they go up a bracket.
Imo pricing it high will make them money, but it won't really change any of the status quo. If they price it low enough they won't make as much money directly, but they'll gouge a big piece out of both the console and Windows OS market for themselves.
But I doubt that's what they're after though, they're happy with all the Steam money they're making, all of this is just mucking around for them to keep busy.