Gold gouramies are a color morph of the three-spot (trichogaster trichopterus) so, without meaning to sound blunt, no, I don't think they were a good choice.
Having said that, that's the simple answer. It also might work out ok - I just wouldn't have reccomended that particular species with angels.
Don't get me wrong - three-spots are beautiful fish and I'm not surprised you picked them out. It's just that they are not the best for this set-up.
The trouble with three-spots is that they become increasingly aggressive as they mature and, if they spawn, the male is liable to kill many of his tankmates. Because of their aggressive and territorial nature, they will also be competing with your existing angels for space. That's not too big a problem in a large tank like yours though.
Actualy, my main worry is that you have bought a pair - try to sex them deffinately (post pics if necessary) - males are prone to fighting to the death once sexualy mature.
If you have a male and female as you suspect, you could always just add a couple more females (if you add just one, the newcomer may get bullied - it's always best to add new gouramies to or more at a time to devide attention).
If you wouldn't mind doing so, consider replacing the suspected male with a couple of similarly-sized females - 3 females should be relatively peaceful together, are less territorial so won't be competing with the angels as much and, as they'll never spawn, shouldn't pose a threat to non-gourami tankmates.
The upside to this species of gourami is that they are ludicrously hardy - they can live through almost anything - and can handle any angel aggression very efficiently. They also won't normaly harm tankmates (provided they are not in 'spawning mode'

) and are the perfect 'centerpiece' fish as far as looks and general behaviour goes (IMO anyway). In that sense, yes, you made a good choice
