Bathroom fans, heating, etc

Looking for some advice, maybe from someone who does a lot of remodeling or designing.

I currently have a bathroom that is fairly small in size and only has a single vanity light and an overhead exhaust fan. In the future I would like to do two things to this batroom, add some natural lighting and add some sort of method of heating the batroom.

For the natural lighting I plan to replace the current exhaust fan with a solatube with integrated bath fan, see http://www.solatube.com/homeowner/brightenup.php under accessories.

But that leaves me with a small dillema of heat since the solatube doesn't have a built in heater like many other vent fans you can get. So I have a few options, go to a plain solatube and add another vent with integrated fan and heat into the cieling or keep the solatube with the exhaust vent and add just an electric heater to the cieling, or finally I could just duct in a small vent off my furnace into the bathroom which wouldn't be a lot of work since my furnace is in the attic and happens to be about three feet from the bathroom. The downside to the furnace hook in would be that I would only have heat in the bathroom when the heat is running in the rest of the house.

Anyone have any tips as to which approach might be better? Or anything I haven't thought of?

And I just realized there is a kitchen and bath remodel sub forum.. don't I feel dumb.