My ADVICE
Mate, Price doesn't necessarily mean quality and after all this rating is all about stopping you from killing yourself and/or your pax.
$500? That would get you about 1.5 (generous) hours in a training twin. You won't get a rating for that. I did mine with Ad Astral in Perth (Ron McGrath, AKA McGilla) ex CO Pt.Cook. He knows his stuff (understatement), trains to a standard not a price and will not rip you off. The SIM is good and a cost saver and from memorythe aircraft were in good nick. More on the point of him not ripping you off. The last renewal I did with him was .4 in the aircraft the rest in the sim. Shop around but I think he would be hard to beat on cost AND quality.
Sorry, just re-read your post and notice the bit about multi international etc. All the more reason to give Mc Gilla a call and discuss it with him. He would know what you need to do.