Aqua Clear Filter Q's

[kit]

I'm picking up a AC 110 (aka 500), but the fish store suggested I needed to buy 4 seperate filters for it.

I wanted to ask this forum for an honest opinion and not from a salesperson point of view (though all comments are welcomed).

The first product is the FOAM insert.
The second product is the CARBON insert.

So far I assume that these 2 are required.

Now the next two I am not sure about?
The Ammo-Rid
The Zeo-Carb

I don't think the Aqua Clear would fit all 4 items inside the housing, and I on the packaging, all of them (other then Foam) are labeled as "Step 2".

Which of those do I buy and in what order do I install them in my filter?

Thanks all for for your help.