I fish Borumba all the time Gary, it's a fantastic fishery, you'll love it. You will only need a couple of spinnerbaits, 3 at the most. Maybe 1 x 1/4oz and 2 x 3/8oz.
I'd stick to TT Vortex, Smak Tournament, Bassman (Carl's Compact model is good), and PML (might be hard to find). There are a lot of bass comps held at Borumba and it's rare to find any of the top anglers using a spinnerbait that's not one of these. Popular colours accross most lures at Borumba are white, and also dark colours, esp purple. I've won a couple of comps there using the same 3/8oz purple TT spinnerbait. Don't worry too much about the colour of the blades, both gold and silver are fine. And whatever spinnerbaits you buy, make sure you use a stinger hook.
Besides spinnerbaits, Jackall TN60's, 1/4oz Blades, and 2 - 3 inch paddle tail plastics on 3/8 jigheads work well here too.
Cheers