I have two AquaClear 70's on my 60g. (I started with just the one and quite liked it but wanted a bit more media capacity. Rather than dump the AC and get a canister, I thought why not add another AC?)
The one filter has a fluval pre-filter sponge on the inlet tube. It has a scotchbrite type pad, then is loaded with seachem Matric bio-filter media. The pre-filter prevents mechanical filtration loading so with the exception of routinely cleaning/rotating the prefilter sponge, this "bio-filter" just runs and runs.
The second filter has the AC sponge, a custom cut filter pad (pictured here), 2 100ml bags of Seachem Purigen, filter floss and another AC sponge. (The Purigen is a new experiment. It's a synthetic polymer adsorbant that attracts dissolved organics to it's surface - the removal of dissolved organics is not unlike what a protein skimmer does in SW aquariums.)
Note that both filters are set for minimum flow, maximum re-filtration and use simple water bottle baffles to reduce flow back into the tank.
Now I gonna have to disagree with Nubster - the AC sponges are very porous. Although they make an excellent mechanical filter and 'platform' for beneficial bacteria, by themselves they will let small particles through, so you really do need some filter floss or other fine filter pad in there.
If I was you, I'd start out with the AC sponge, a finer filter pad, the AC bio-max and a good hunk of filter floss. (Keep the activated carbon in reserve for when you made need it for temporary use to remove meds or something.