Need help sizing a water softener (most likely a Fleck 7000SXT based system) for my house. All pertinent info is below.

Water Main Size: 1-1/2"
# of bath rooms: 6
Large tub(s): Yes(1)
Shower(s) w/more than 1 shower head: Yes. Master shower has 2 shower heads.
Clothes washing machine(s): 2
Dish washing machine(s): 2
Regenerate 7-9 or 3-4 days?: 7-9
# of permanent residents/people: 6
SFR: 12 GPM
Hardness: 17.7 gpg
Iron: Manganese: pH: 7.6
TDS: 491 mg/L
Chloride: 45.4 mg/L
Calcium: 81.7 mg/L
Magnesium: 24 mg/L

Here is a link that might be useful: Complete Lab Test On My Water