here is my recommendation. predator tanks require robust filtration because of the waste generated.
75g tank with overflow, 20g sump, return pump, turbofloater 1000 (or multi) or similar skimmer, 100w heater, 80lbs of base rock and about 75-80 lbs of sand (unless you go BB).
keep it easy. this will give you good filtration and make the tank easier to manage. get the LR in early so it can cycle with the tank then give yourself a few extra weeks on the cycle (i say 6 weeks) before adding anything.