the red violin is stunning, eurotrash could be interesting upstairs with all the paintings etc and is a large space. that big one on collins st (i have had a blank) i think that is all i know of, i cant remember any names... been quite a while since i was down there partying, but the red violin i know for a fact would look awesome for somthing like that!
Besides, it's the opulent venue and decor that you want, no? If you are organising an event, it is likely that it'll be a ticketed event - therefore controlling the social circles that come to the event and make up the right atmosphere. Overcoming the issue of an unpreferable crowd. Silk Road is the kind of place where you have to know everybody there to have fun, or come with a group of friends...otherwise it's terribly clicky! The only drawback are overpriced cocktails.