Tera can make you axle any way you want it. They will put the solid knuckes on it if you would like. As far as the pinion bearing thing......Yep they do use a bigger pinion bearing which in no way is a downfall. It would be the same bearing as what you already have in ther rear. It's not a problem, I don't really know anyone who just toasts the pinion bearing. If you smoke the bearing,you have ALOT bigger problem than getting the bearing.
As far as dynatrac, they have a similar problem to what was brought to light earlier. They have a skimmer/dam inside that keeps the oil up at the outer pinion bearing, if something happens on the inside and that skimmer/dam gets damaged, your looking at a couple day minimum to get that seal from dynatrac. They all have little ticks like that, but tera is the closest and parts are readily avalible.
Just my .02
PLUS it would match your rear. An thats cool....
P.s. Did you get your t-case fixed? I thought you were going to get a stak?