You could pull the trigger for 300 but not 500 for a pair of far-better-made and perfectly matched stands? And then try to save $ (yet increase hassle-factor) and expect a decent setup with non-matching stands? come on. Shop around. Ditch the Osiris. I am sure you can find Aerial stands for less than retail. I have a pair of 5s, the stands are worth the extra money, and mate perfectly with the speakers, securing them to the stand with 2 large allen-headed bolts. These are the best 2-way monitors I have ever heard and have compared them against many others that I have brought home. They deserve the best stands, and the correct ones. Do yourself a favor and do what you should have done to start with - get the Aerial stands.
-Ed