Just remember that if your lines run through un-conditioned space (I doubt yours would), it should never be insulated. The space should be insulated to the outside of the piping. we have had many people with insulated piping NEAR a freezing area and the piping burst because it could not get warmth from the room, however little it was.
If the distance is not too, too far and you don't use the bath much, you could try 3/8" tubing which is fine for a low flow shower. The bath might just take a little longer to fill but there would be hot water savings (but not as much as going from 3/4" to 1/2".)
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