The MFD is also my favorite of the hot split-coils. It's just huge, and flattens any stock Fender for punch. I agree it isn't old school, but it's definitely in the P-bass family, and as others said you can get a more vintage tone by rolling down the volume. While you can get lots of variation with the volume controls, I've bought the parts to add a tone control to my SB-2.
You could also look into the recently re-introduced SB-1. It's not on G&L's site yet, but it's out there. Then you get the MFD split-coil and a tone control. I would actually prefer that to the SB-2, because I don't use the bridge pickup much, and like the minimalist classic P-bass approach.
For playability, keep in mind G&L uses a Plek levelling machine at the factory, so the action gets incredibly low on current models. (They started with Plek in mid-2006 I believe.) My Plek levelled G&L's with the #8 neck have near effortless playability. I still love my Fenders, but the G&L's are a notch better in this respect.