As someone mentioned, the larger 18' wide garage door is VERY nice...allows two cars to be pulled in without "fanning" out from the entry. Some people prefer a pair of 10' wide doors so when you open one of them in the winter, all the heat doesn't rush out as quickly. That's personal preference. A good quality, insulated garage door is a must for heat. Check out the Raynor Affina door:
http://raynor.com/products/affina.cfm
Is the best-built door available and has an incredible insulation value and thermally broken door sections. These doors have powder-coated track and nylon rollers...so no metal on metal contact that can drop metal dust. Also has a full-lifetime warranty; so it may be pricey to begin with, it will last as long as you do.
Also mentioned is hugging the garage door to the ceiling if you have any space up there. It's call "hi-lift" track. It can be gotten in increments that will allow it to go up against the ceiling and out of the way. This is VERY good for lighting because sometimes you want your door up on a nice day, and it will keep the door from covering up your ceiling lights as much. You will need a wall-mount garage door opener for this:
http://www.liftmaster.com/lmcv2/productdetail/19724/elite-series-wall-mount-garage-door-opener/
But again, then there's no opener overhead to get in the way of you or the lights.
T8 is old-news...check out T5HO lights. I installed these in my garage and they are the best. You can get them in moisture-tight housings if it's needed (maybe on the ones for the walls). Eventually LED will be the thing, but today is not that day. T5 is the best choice. You're still going to end up using a halogen set to walk around the vehicle regardless...as they show your defects best.
Flooring...NO Racedeck. You want a poly-aspartic coating. This is similar to epoxy in looks and appearance options, but it's abilities are well beyond. It's not really much more than epoxy either. There are various brands out there, but I think HP Spartacote the one of the best:
http://www.hpspartacote.com/
Depending on how they finish your concrete, and your abilities beyond detailing, you MIGHT be able to do this yourself and save some $$$. Flooring places that sell the products are generally pretty good about educating a person on using it. And there's plenty of videos online showing it too. This stuff is nearly indestructible...specially for this type of use.
Drains, plumbing, and wiring aren't my thing...so that's about all I have to offer. Good luck.