I have made this one a few times and it is one of our favorites. It's not a quick meal, but not horribly labor intensive either. I usually use zucchini and/or summer squash instead of eggplant, and sometimes I just use green bell peppers instead of red and yellow to save money. I also skip the green onions and don't even notice a difference. The feta really makes the dish, so don't skimp on it!
I have been trying different olive oils in the past month to find a cheap one that tastes good. I bought some Colavita olive oil from the grocery store and it has a nice flavor - not too strong. I've tried the Walmart brand and it is a little off smelling. The Carapelli brand is okay. I have to start tasting the oil from now on and compare the flavors. We use olive oil all the time and I want to use a good one without breaking the bank.