I've checked out the free trials of WebEx, GoToMeeting, and ClickMeeting, and they work wonderfully for webcams – however I'm finding that they're all similar in that they lock screen captures to very low FPS (typically less than 15). I know the hardware of all devices involved is more than capable of going higher than this, and I have tried these software packages with several different powerful computers to make sure that is the case.
In short, and as a little background info: My company's CEO is looking for a high-quality remote collaboration all around solution (or at least 30fps when he or someone else in the call shares their screens!). He is willing to pay quite a bit for it as well. I simply can't find anything that works without layering software tools on top of each other. We've even discussed the possibility of using something like GTM in addition to a software like OBS, Xsplit, etc. – and while that's an option, we want to keep this task as simple as we possibly can.
As for the platform, we are flexible. We use mostly Windows but also have Macs and iOS devices as well. So we can flex around if we find something that works.
Thank you all for your help with this.