No offence or anything but how did you end up getting a job as an instructor if you've never owned a board? 1 week a year is not a lot of riding experience. (not bashing in anyway i swear, just curious)
You don't need 2 boards unless you dedicate days to riding one thing(park, pow, etc). If its burton you're after you can always go with the Custom/custom v rocker which is a multi tasker. I spent the last 2 years on a Custom v rocker and have no complaints. The only thing i hate about the new burtons is the Channel set up which means you can not use the bindings on any other board.
Ive been snowboarding for over 10 years and im from florida so I cant just go when I want to. I wakeboard and surf a lot, as well as have good qualifications working with kids. I normally go 2 weeks a year and seem to keep up with my friends who have been on skiteams and been ski/snowboard instructors.
Thanks for the help!