For good tar performance I'd say get Mitas E07, Mefo Explorer (if you can find one), Kings KT966 or Bridgestone TW42.
I would not get a T63 to do tar & commute. Good mileage but rather scary especially in the rain.
I'd also avoid mixing brands and patterns. I've seen too many scary or at least unpleasant results. DP tires like the E07, KT966 and the Bridgestone TW41/TW42 combo work surprisingly well on "normal" dirt roads and only struggle under the most ardous conditions (snotty clay, deep sand).
Practice your tire fitting skills: Ride DP tires during the week, change for MX block fo the weekend
