Down in the review section there areFury reviews and a video link that will answer several of your questions.
3. Is the Champion worth it?
It depends. If you're planning on starting a collection going the Warrior route will allow you to spread your funds further. If you're planning on just one saber go champion tier. Personally I don't care much about sound and only have one saber w/it but I'm an outlier.
5. Does it already come with the V4 blade and does the blade plug come with it?
Anything above initiate tier comes with a blade and a blade plug (other than the thin necks which don't come with a blade plug).
6. I like colors that go with the blade. I am going to choose blue. Which blue is the best? Arctic Blue, Light Blue, Medium Blue, or Deep Blue?
You personal preference wins the day. Generally is is thought that arctic blue is closest to ANH/ESB blue, Medium blue is CW/Prequel blue.
7. I hear great things about SaberForge and that is why I am choosing it. However, I have heard stories about the Sound box rattling in side the hilt. Does this actually happen?
Sometimes whil dueling the speaker can get loose; however a minute of readjustment with some needle nose pliers can fix the problem.
I would heartily suggest reading the
Saber Forge FAQ , it's full of great info for first time buyers.