personally i dont beleive bearings are goin to make much difference. In my experiance, its the syncros and input shaft that are the weak spots on a t50. But lets face it, they are getting old now and are bound to break sooner or later.
This is coming from someone who has just stripped 2nd behind a stock 20v. So the motor will not make much difference (unless it has one of them dirt turbos on it) depending how you drive.