Advice appreciated ...Large Planted Aquarium

I have (successfully) had planted aquariums for several years now and
consider myself to be reasonably knowledgeable about them in general.

The largest tank I have had however is only 30 gallons. I know very little
about larger tanks.

I am now in a position to acquire and set up a larger tank. I will pretty
much be starting from scratch (except for the CO2 system which I already
have, and even here I will probably get a new reactor).

What I would like to know is: What would people with larger tanks out there
recommend ?

1) I am thinking of either a 75 gal (48"x18"x20"), a 90 gal (48"x18"x24") or
a 120 gal (48"x24"x24") tank. Does anybody have a preference for any of
these? Is a 24" deep tank going to require much more light than a 20" deep
tank?

2) I have used and like Emperor Power Filters on my smaller tanks. Is there
any reason not to use one on my new larger tank? What do people with larger
tanks recommend for filters.

3) Lights. I am thinking that I will use power compacts. Any comments?

4) I plan to use gravel over a Sea-chem Flourite substraight. I have had
very good results in the past with this.

I would really appreciate any comments/recommendations on anything above, or
on any other aspects of setting up a large planted aquarium.

Thanks !!

Henry