A couple other things to check:
The main ground from the battery to the chassis: Located behind the battery under the carpet. Be sure the connection is clean and sound.
On the drop-down fuse panel. There are a few posts with large red and green wires connected to them. Be sure they are snug, but be careful not to twist the posts off the drop-down panel.
Both cooling fans should pull air into the engine compartment.
Battery should be load tested and fully charged.
I fully agree with the flush of the cooling system,
oil and filter, gas line filters..
Tires should be inspected but if the car was stored properly (temp controled enviorment) and under 10 years old they should be safe to use for a while.
Brakes should be inspected.
Regarding the suspension changes, inspect everything, especially the rear shock mounts, but if all looks good and sound, I'd back burner those modifications untill after you have some miles on the car.
Wheels: The most fun project may be removing the wheels, lubing the pins, and reinstalling them. You will need a good lead hammer (bigger is better here) and some anti-seize compound. (And maybe a 6-pack of beer) - I'll bet they have never been removed...You can get help here on CC or contact me if you like.