I'd vote for a decent pair of well ventilated trail runners.
IME, waterproofing just makes for sweaty wet feet, and disallows good evaporation especially in a place as hot and humid as a rainforest. As for brands, go to an REI or similar outfitter, try stuff on, buy what fits best. Be sure to break them in before the trip.
edit: It's important to have a quick drying sock as well. Regular cotton socks are terrible for this. Something like a synthetic or a merino wool blend hiking sock will work much better.
Last edited by gooberlx; 02-24-2015 at 03:17 PM.