Good luck with the new garage space Bigbore. I have some lighting input for you.
There are several different types of lighting that you can use to light a shop/work space. they are
1. incandescent
2. fluorescent
3. High pressure sodium
4. Metal halide
5. CFL
6. oil lamp (jk)
7. mercury vapor (crap)
They all have advantages and disadvantages. First off, Incandescent, mercury vapor,and CFL's are shit for lighting a big space. The thing that you need to know is that High pressure sodium is not color corrective and can cause problems with different color of wires and when trying to color match some paint. I would stay away from this type of lighting. Next up is the Metal-halide style of HID high-bay and low-bay lights. They are great at color stability and provide a good even 4000 Kelvin to 4500 kelvin coloring. The fluorescent is what I'm running in my shop. I have a special F96T8HO4200K lamp that has a cold start ballast in them. I'm in Chicago and i have no heat in the shop but I have no trouble getting my Overhead florescent to ignite. Also i read in one of the reply's to individual switch each light fixture, and i totally agree. I have 4 lights and 4 switches.
Also remember that your general illumination will be just that, general. You will always find a need for a drop light no matter what so make sure you have an overhead provision for the retractable overhead shop light.
Thats my take on things. good luck.