FYI - can't speak to this koala but the others that I have seen are like all other cabinets (with the exception of really expensive custom ones) just have wood looking veneer on them. In the premade cabinets, Koala is one of the nicest, but in this case don't know how much of a difference that would make from the white one that I have seen from other places that the machine comes with.
I would probably check a few other places that are within driving distance if available and check their prices and then go back to the dealer closest to you to see if they will match. Unfortunately most dealers will not give you a price over the phone.
I do agree that one of the things you would probably want is the stitch regulator - check to see if that comes with the package. If not how much it is.