What's your budget? If you're aiming for a low light setup, around 110W of PC would work. T5s would be more efficient, however...what's the length of your tank?
You can basically have the same setup as before without any problems. At a low-light/low-tech level, you won't need CO2 and your HOB filters will work fine. Your bioload seems pretty low too. If you want more livestock, consider a canister filter.
You can basically have the same setup as before without any problems. At a low-light/low-tech level, you won't need CO2 and your HOB filters will work fine. Your bioload seems pretty low too. If you want more livestock, consider a canister filter.