Yeah Damien,I go regularly.
The NCRG Hamfest is the big one for WA,but it is smaller than the NSW one dave went to,reflecting the smaller population of Hams in WA.
It still fills a reasonable sized hall,& is well worth attending.
The HARGfest is in a much smaller venue,but still often has some really worthwhile stuff.
The BWDs don't sound bad--they usually have nice bright CRTs,but one thing to watch for is that some models are prone to triggering faults.
The Hitachi sounds like a good unit from what I have seen on the Internet.
You may be able to pick up a Philips,or even a Tektronix or HP 'scope at either the HARGfest or the Hamfest.
I found my Tek 7613 100mHz mainframe 'scope complete with two vertical plugins & a dual timebase for $135 at a Hamfesta few years
back.
It's a great CRO,but the downside of the 7000 series is that they are quite large,& heavy.