[black69]

do truss ceiling to get car lifts to work well. Go atleast 24' deep. I went for 16' peaks.
build it as big as you can.
do 2 x 6, don't cheap out and do 2 x 4. this way you can do decent insulation without spray foam.
I like a tan epoxy floor. no sand additive. Its slick but looks nice, cleans up nice.
went with recessed lighting like in a home.
I am a fan of forced air, as when I go in to the garage, it can heat up fast.
a radiant heat floor means you have to keep it hot all the time ($$$) to work.
then what do you do for air conditioning? Air conditioning is easy to have on a forced air system.
do not seal your concrete, keep it clean so you can expoxy it without having to strip it.
pour floor thick as you can, I went 8 inch thick, made sure rebar was pulled up, etc. Did not want any cracks.