As a practical matter, there are so many applications that require Java SE 6, that you should install it anyway.
You can install multiple versions of Java on OSX.
I have Java SE 6 and Java 7 SDK. The SDK is needed for Android development. You cannot use Java 8 for Android development. (I do not mean Rhodes itself - Android SDK itself needs Java 7 SDK).
Java 8 is one of those cases where the latest may not be the best. There aren't many applications yet that that require or work with Java 8, IMO.
If you have something else that needs 8, go ahead and install 8. You can have 6,7, and 8 on the same system.
Thanks, Jon Tara!
I just hoped for a second to avoid installing multiple Java Versions on my clean install. (: