A new belt is about the only thing that would be needed to keep the Basis in fine fiddle. I own a Basis and I have heard the Phantom on a different Basis table. Both the arm and the Basis table are designed to maximize damping of vibration, both from external sources and the vibration caused by the stylus tracking the groove. The sound of this combination is clear, composed, and quiet (very good at even suppressing the sound of ticks and pops because the sound passes quickly instead of resonating). I personally like this sound at it works well in my very dynamic sounding system (horn-based speakers).
But, this sound is not for everyone and every system and I understand those who call this sound "dead." It is entirely valid to prefer something that sounds more lively and "jumpy." If you want to mix things up a bit, it would be nice to also have something like a good vintage idler drive table like the Garrard 301 or 401 or Thorens TD 124 or the three motor belt drive Audio Note table. These, with the right arm are more lively sounding than the Basis/Graham Phantom combination--i.e., different, not necessarily better. At this level, it is more a matter of different taste than something being better than another. The same is true with the original issue of choice of phono stage; it is hard to say that something would be considerably better than the Steelhead.