Planted tank substrate suggestions?

[Dale]

I think it depends on how serious you plan to be.
If you're not planning a Dutch or Amano style tank then you could probably consider it moderate; just don't go for the more high light demanding species. If you want to go all out then you are probably on the low end (how deep is the tank BTW).
When upgrading your lighting and adding fertilizers you also have to factor in CO2 dosing as well. You can run a balanced system and experience little algae growth with moderate lighting, fish waste and no CO2 injection but if you up the lighting and nutrient dose without aux CO2 you may run into nuisance algae blooms. Your plants just can't respire fast enough. I experienced this on my 140G. with 4X96w PC's/no CO2. Running all four lights was too much (hair and brush algae blooms) and I ended up running only two with much better results.

Here's the 140G.