Views of the temples of Bagan
He bus From Rangoon to Bagan it leaves for about 14,000K and takes between 10 and 11 hours. They usually go out at night and both the bus and the road are pretty decent so you can sleep. We went from Mandalay for 7,000K is a much worse bus and a road in worse conditions.
The other alternative options are the train or the ship. You can go in ship from Mandalay. We looked at it and the cost was between 25 and 30 USD for the fast boat and 10 USD for the slow boat owned by the Board (you can only pay the ticket in US dollars and your money goes directly to those pigs).
He train In Myanmar it is generally quite cheap but it is a journey that seems to take you long to forget. We did not take a train - although it is my favorite means of transportation - because they only accept payments in dollars and the money goes to the Government but we met people who had taken it for some trips and they told us that the wobble is continuous. Sleep seems to be an impossible mission due to the hardness of the seats and the continuous jumps that are nailing the wood in the kidney. The positive side is that you have the opportunity to meet the local people but always without forgetting that your money goes to the wrong hands.
Forget about rent a car or motorcycle as if you can do in most neighboring countries. In Myanmar they only rent you sometimes in Mandalay since the tourist is not free to go wherever he pleases.
Anyway, you have to get to Bagan, so you choose