hey gizmo, sorry to hear about your oscar.
firstly, im dont know anything about goldfish so i cant help you there!!!
second, other fish you could put in would be things like severums, jack dempseys, convicts, kribensis, jewels, heaps of different cichlids really!!!
or you could go for lots of small fish and have it has a HUGE community tank, ie, neons, dwarf cichlids, danios, angels, discus, corys etc. etc.
you could get another oscar but you dont seem keen on that idea i dont think
you could make a MEANLY planted tank consisting of mainly plants and a large school of small fish or something.
whateva you end up going with, good luck and im sure it will be nice
**EVIL**
:bounce: