looking to buy'05 or'06 Passat
I agree with all of the above comments.
First of all buy the nicest Tdi Passat (wagon preferably) that you can find. They're out there. Have it carefully checked out by someone competent. Verify as much as possible that the proper oil has been used and changed regularly. Check service records for brakes, suspension, cam belt replacement, fuel filter replacement etc.
If in doubt, have a knowledgeable mechanic check the condition of the cam.
If I remember correctly the BSM can be eliminated while the new manual gear box is being installed.
Don't bother with a new BSM or a geared BSM, just put in a simple oil pump. It's more than adequate.
Be sure that there are no corrosion issues as the 12yr VW warranty has now expired.
I pretty well bought the first wagon I found with a bad transmission. It had 200km and corrosion issues.
Thankfully VW Canada (reluctantly) agreed to replace two front fenders, new hood, new hatch, three new doors, repainted roof and rear quarters.
That work is done now but it required a lot of running around and even a trip to Small Claims Court. That's why I can't over emphasize finding a vehicle that is corrosion free.
After all is said and done I thoroughly enjoy my wagon. I've added a Malone 1.5 tune. I consider the vehicle 1/2 sports car, 1/2 tractor.
It has gobs of torque and there is no reason why it can't be my last vehicle.
I could tell you about how much nicer the Passat is over my recently purchased 911 SC, but that's another story.