If you've got some money to blow get a car lift. Can find ones for a few thousand (it'll be the shipping that'll kill ya).
Make sure you build the header of the door high enough to compensate for a lift and tires. I use my buddy's garage once in a while and have to air my tires down to about 4 PSI to squeeze it in. And there's only one spot I can drive it in - way to the left.
I realize it's also ridiculously expensive, but in floor heating, warm concrete is always nice. If you've already poured the pad though....
Lots of plugins, and lots of lights. I agree with the phone/cable line for internet. Can have an old beater shop laptop to look up info. Instead of getting all cleaned up, going inside the house, printing something....blah blah
Water line - you could have a shop sink. Could always get a solvent bath too. Get a fire cabinet inside for chemicals, paints, etc. Bench vise, anvil. Lots of counter space, I hate working on something and have to lay out all the parts on the floor, someone always ends up scattering them.
That's all I can think of.