AJC,
I have had over 8 guys from work go through Ad-Astral in Perth, people keep going back, which always is a good sign.
They provide very comprehensive briefing material, not only for the multi engine side of things, but also for the IFR training. They will provide you will a schedule outlining all your briefings and flights before you even start.
They fly from Perth International airport, you will get to do heaps of real IFR departures and arrivals, and three out of the four runways at Perth are ILS equipped. Coming into winter, its the best IFR training ground, heaps of cold fronts come through which will require you to fly in IMC. You will also get to land off ILS and VOR/DME approaches at Perth.
The sim they have is very good for simulating engine failures, it basically a Navajo setup, it also has a real KLN89 GPS installed for doing GPS NPA's.. Their aircraft is well equipped, all aids including GPS.
You should get the IREX done out of the way first, get your KDR, and study up on the areas listed. You would have done the same for the CPL. Make sure you also study the theory side of things that are on the
Application for an Instrument Rating test form.
You will need at least a PPL, 50 hours cross country command, and 5 hours night PIC to receive an unrestricted instrument rating.
You can find out more info at
http://www.ad-astral.com.au/
If you are coming from the eastern states, have a look under "Current Specials" on the
Ad-Astral web site.
When space permits, a few guys I know had a chance to sit in the RH seat on an IFR charter with Ron in a King Air out and back to one of the mines, it is an experience in itself.
My only last piece of advice is, the IFR rating is not something to cut corners on, your life will depend on the quality of training you receive.