As to the belt drive being cheaper, if you look at top end turntables available today, they are belt drive (10-28-08: Stanwal)
That's because no one of the world famous TT producers has money to invest studing and building such wonderful motor inside the Technics SL1200 , no enough numbers of TT sold to justify the amount of $$$ , a cheapo little belt motor is perfect for them
God save the Technics SL1200!