Cary pre/pro with ARC amps sounds fantastic with Vandersteens! What about looking into a couple of ARC SD135 for surrounds... using the VT200's for the fronts only. Another alternative would be to use one of Cary's 5-channel amps for drive surrounds and center, but I would be a bit concerned over the blend between center and mains then... you would really need to try this out in your home settings.
Although the SC-07 is a decent receiver, I'm pretty certain that's what is holding you back right now...
Although the SC-07 is a decent receiver, I'm pretty certain that's what is holding you back right now...