Depending on the room temps you keep the enclosed sides of a rack may not be enough either. A split T8 may be a better choice if your home stays cool or you are worried the ambient temps will be low in a rack. With a pvc cage you can always add a RHP or even a lamp if needed.

I just ordered a T8 today with a divider and a light. It is on sale right now and it their quick ship selection meaning it should be ready to ship when ordered. Was $242 shipped for me.