I also got the big Blu knob originally, but in the end I didn't really like the look and plasticy feel. I ended up getting the TokenTop™ Premium Spinner Knob which although is a bit more pricey, looks and feels a lot better.
Alternatively you will get a slight discount ordering a aluminim knob when you order the TT2 spinner which you cannot get afterward.
I guess I'm just saying be sure the big blue is something you want ... it may be a better initial investment to get a premium knob right off the bat.