I go with the super. Its a step up from the best, and you'll be happy with it, and glad you did. Its just an all around better brush without getting into the more expensive silvertips.
If at all possible, pony up extra $23 and get the Super. Otherwise, you'll always be wondering "what if..." and you'll probably end up getting it anway within a very short time. I have an Edwin Jagger made Super Badger. It rocks!
I have had both the EJ medium best and super brushes. The super is the better brush. The EJ silvertip brushes have smaller handles unless you get the Chatsworth and quite a bit more price. The super is the sweet spot in performance/value.
I have an EJ super and don't like it at all. It's brilliant for creating a lather in a bowl but useless for face lathering. Once you have bowl lathered, it is OK to paint the lather on your face, but it is useless for preparing your face. I would definitely go for the best ... or a Rooney super (which has better backbone for face lathering and will also bowl lather).
I recommend getting a Rooney (1/1) in Super Silvertip, since you're already considering a $68 brush. In that price range, there are far better brushes than anything EJ makes. For just a little more ($75 or so), you can get a custom Shavemac with Finest hair. Go with a 19mm knot diameter and 45mm loft. Just email Bernd at Shavemac with those dimensions and pick a handle style and color from anything on the Shavemac website. EJ brushes are not very dense and tend to be floppy. If you ever face lather, you'll be happier with a Rooney or a custom short-loft Shavemac. If you never face lather, a Rooney or custom Shavemac work wonderfully with a bowl, too. See the reviews in my signature, as well, if you want some more custom Shavemac info.