>but there are a few differences here and there that make it hard (especially for newbies) to get help from Schemers using a different flavor.

I don't understand the reasoning. Yes there are different variants of Scheme. All you have to do is look and ask for what you need. How does the difference make it harder for newbies to get help? Have you asked any questions in the mailing list for any of these implementations and not received a reply? Have you looked at what these languages even provide? Do you understand the difference between an editor and an implementation? What were the difference that you found confusing in the implementations? What were the criteria for your project?