As for what machines to get, ask to have one fully data capable that monitors your therapy, not just the hours of usage.
Beyond equipment, there are lots of tips from long time users in the forums -- so do spend sometime reading about others experiences for tips on accessories, masks, cleaning and assorted other topics.
Lovin' my CPAP since day 1! (January 2015)
If we aren't cleanin' it we're breathin' it!
"Take it as it comes, specialize in having fun"
-- Jim Morrison