like above mentioned with any tank, even more important the larger you go, you need to figure out what you and out of the tank, set a budget, and then start to figure out your components.
I have yet to try it in a tank with fish, but in experiments with Miracle Grow organic potting soil and a sand cap, I have had great results with a plant clippings tank and bringing things back from near dead. I would look into this, especially as you are going tetras and angels and the MG has a lot of peat in it and will keep the water more acidic.
Also I have a 55 that had a $130 Power compact light on it for a few years, one of the bulbs blew out, I went and bought a temporary twin tube T8 from Lowes $20 with bulbs, and it looks just as bright, I was surprised and a little mad that I spent the extra money a few years back.
There are many answers for every question and with tank setup I would say your first priority is set a budget and then figure out what components to go for based off budget.