Which Maintenance Manual (s) to Choose ?

Ive been doing alittle research on the Toyota maintenance manuals for a 2007.

The total for all manuals is $462.46

If anyone has experience with these, which one(s) would a person choose that just wants to maintain their vehicle ?

Vol #-1 Service/Maintenance/Engine
Vol #-2 Suspension/ Drive/Axle
Vol #-3 Navigation/Interior/Exterior
Electrical Wiring

It looks like #1 would cover all that is necessary plus maybe the Electrical.

Thanks !!!