You ride a shorty so you'll wanna skip Middleton and head straight for Waits or Parsons. Got steeper takeoffs, more size and more critical sections. Shacks sometimes too (depends on the wind and swell direction, as usual).
If you want a really, really cheap new wettie call the Wetsuit Factory (South Road, Reynella, 0413 372 925). They are normally cheap as it gets. But they are shutting down and eliminating their stock! So even cheaper!! If you just want second hand do the rounds of the pawn shops and you'lll get something decent that's cheap (sniff before you buy tho).
There'll be waves down south all weekend but cleaner on Sunday. If you want to do Saturday you'll be best on the dawn patrol (start driving south at 5am mate).
For forecasts down south:
Swellnet SA South Coast
Surf South Oz South Coast
If you wanna meet crew and have time to surf mid-week keep an eye on those forecasts and make sure you are at Seaford Reef when they expect waves. Especially on an incoming (esp morning) tide. You've surfed Indo and Vanuatu so your skills will be fine - don't drop in, surf well and be friendly in the carpark and you'll meet shortboard crew.
I've got a house full of sick people so I'm not gonna get a surf this weekend
I'll post or PM if I remember anything else that might be useful. Feel free to ask anyway