Doors and Windows - Good external doors

I recently purchased a home close to a creek.
The front entrance door is a double 32" door with 12" sidelites.
The doors are steel with aluminum sills but the sidelites are all wood and are rotting on the bottom.
The doors are old so I decided that I may as well replace everything.
My wife wants a storm door so she can open the door and look out.

I started looking at steel doors but was told that a smooth finish fiberglass is about the same price, easier to install, and transfers less heat.

I have looked at a lot of doors and am convinced that Therma-Tru fiberglass is a good door. It is a bit more expensive but seems sturdier.

I found a store, WindowRama, that sells it for less than HD and will deliver it quicker, fully assembled, doors and sidelites.

Are fiberglass doors really better than steel?
Will I have a problem with a storm door on a fiberglass door?
What are the better brands? HD sells Feather River, how does this stack up?
Should I get a storm door that covers the sidelites as well, or just the doors?

Thanks.

I like Therma-Tru doors. They also sell staining kits so that you can do it yourself. The sidelights on the Therma-tru doors ought to have a sill underneath the entire thing- only thing I should warn you about is to measure your current aluminum threshold and make sure you order a door that is the right "wall thickness" and the right "threshold thickness". You'll get a door with the jamb extension and threshold extension preinstalled. I've found that you can't get the threshold TOO wide. Too wide is better than too narrow, as far as your storm door sweep is concerned.

The mounting of the storm door will make no difference if you decide on steel or fiberglass. The only problem might be getting a storm door for a double door, where the fixed door has an astragal, not a mullion. I've just installed custom sized "picture" storm windows on sidelights before.

I'd be sure to order the storm door from the same place I get the door- that way there will be no confusion as to what type of storm door you need.

I'd get the woodgrain finish, if you have that option.

Thanks.

The wood grain is nice but it is almost 50% more expensive. I feel that, since I will have a storm door anyway, the woodgrain look will not really show enough to justify the extra expense. The house is a split level and the the door is at one end of the living room. I expect to paint it.

I'm concerned about the storm window on the sidelights. My fear is that if moisture gets inside the gap between the sidelight and the window that there will be fog on the glass, or worse, mold.