You cant fit any in a 55 gallon for long. Plus you run the risk of losing fish in a tank that size. I dont know how you feel about losing money, but thats alot of money to throw away.
I suggest you wait till you got the bigger tank. Just be content with what you have now. Those Snooks and PBass you have get big and you cant house either in that tank for long.
Eric,
Shame your not in Sydney bro, There is a guy at the fish shop called Aquamart in castle hill he has a 8x2.5x3 tank and I think stand. He only wants a couple of hundred for it might be worth your while to give him a call