FitnessForums.org is probably my best international domain. It ranks in google well and there is only 1 page with about 20 words

As far as .au I only have .net.au's but I have some nice keywords in dayspas.net.au and babytoys.net.au

all picked up for reg fee

some of my best domains are just 3 letter .nets i have recently picked up, including znd.net and lzl.net, though i do have a soft spot for one of my first domains i had purchase, and the first site i had really made, supercarnews.com

other than that, i dont really think you need a good domain to make good money. that is unless you want to rely on parking to monetise your domains, then youd need great domains for that. otherwise you can build up any domain into what you want it to be, it just takes time, effort, and motivation. sometimes i lack in a few of them :P