I built my dream garage (1000 sq ft w/10' ceiling)about ten years ago. I used the Sherwin Williams 2-part epoxy paint. It was difficult to apply, however, it has performed well. It still cleans up and looks like new. It wears like steel. If you are interested, I get you the series name/#. Use a light colored oil based paint everywhere else in the garage.
A few tips, you can't get it to bright, lumens, lumens lumens. Paint the inside of the garage door a light color, except for the lower panel. A darker color hides the dirt. I don't know your heat source, but, the gas fired infra-red units by Enerco (Mr Heater) are perfect for a garage. I have a 25,000 btu unit in my insulated garage.
Use stainless plug strips for the full length of any work benches. A couple of ceiling mounted cord reels with a work light/receptacle make life easy. It is cost effective to place a small panelboard in the garage - you'll need 4-6 circuits to feed the branch circuits within the garage. A 30A/240 volt outlet is a must for a welder.
Hot & cold water are nice. Utilize windows that can open. An absolute must is a floor drain, minimum of (2) 12" openings and a 4"-6" dia pipe. Also install commercial type gasketing on the overhead door.
I don't like a post in the entry to a garage. If that entry is load bearing, typically, they put in a post. Go to a steel header beam, you can eliminate the post and reducer header height if needed.
If the garage is large you will probably have some form of structural beam (usually wood) running the length or width of the garage, make it steel and it is easy to weld an attachment for a chain hoist. Most residential contractors are not comfortable with the steel beams - force them, you will always gain ceiling height.
If the house has a basement, a door into the basement is nice. One final suggestion, I installed 14 gauge aluminum sheets 3 ft high around the entire perimeter of the garage. This makes it easy to hose down and never requires any cleaning or painting.