KS,
I too had a 20year hiatus from windsurfing (1987 to 2007). My eighties boards were very similar - South Pacific, Hi-fly Pro-Race and a smaller custom fibreglass one. I reckon if you were a competent windsurfer back then, you can't go past a big freeride board (125 - 130 litres) for the lighter stuff and maybe a Freestyle wave board (100litres) for the windy stuff. For me anyway, it was like riding a bike as all the core principles came back fairly quickly when going for the first couple of sessions. I rekindled my love for the sport with a 2nd hand 2001 JP FSW 100l and then purchased a 2007 Starboard Carve 133 for the lighter stuff. Slowly upgraded and now have the speed bug so most of my stuff is slalom orientated for GPS windsurfing. Anyway as someone mentioned get down to Kyeemagh
I reckon you should give Remi a call from the Windsurfing Shed (Sydney based) as he may have some demo gear available just to give you an idea what's out there. Good luck and welcome back to a great sport.
Here's a photo of some of my 80's gear. You're more than welcome to have the South Pacific too.