If you don't know the history of the old ones, you might want to change your belts while everything is apart, too.
NAPA 25-9365 Belt, Air Conditioner
NAPA 25-050446 Belt, Fan/Alternator
NAPA 25-040390 Belt, Fan/Power Steering
Also, I'd recommend you have this gasket on hand...it's not an absolute necessity but installing the water pump is easier if you separate the thermostat housing (#7) from parts #10 and #13, in which case you'll need part #9. Numbers refer to those in the image in post #16 here -->
link
MITSUBISHI MD308724 Gasket, Thermostat Housing, Top
(You already have "MITSUBISHI MD308723 Gasket, Water Pump Housing to Thermostat Housing" on your list, which is part #8 in the image.)
Otherwise sounds like you're good to go.