I agree with Chico.
Assuming that this is a conduit job and he only wants the small circuit for the lights right now, I'd suggest increasing the conduit size so that the wires can be pulled out and replaced in the future.
That wouldn't cost all that much to do today; and he gets to defer the garage decision for as long as he wants.
In fact I'd probably go up another trade size with the conduit just to make it easier on my back when I try to pull 700 feet of conductors out and back in.
