You might consider a greenhouse attached to a window or to the side of your house. That way you can enjoy it year round.

http://longlife.ca/p_w_garden.html

http://www.sunspaces.com/sunspaces/sunspaces.htm

I've seen all kinds but I'm considering the window attachment. I have a window in my kitchen that faces east/southeast and I think it would be just right for seedlings and starts. I need to find out about leakage. Something tells me that they might be as much trouble as some of the skylights.

The most wonderful are the small solariums that attach to the house.