My ticket from Bagan to RGN was 13,000 Kyat -- it was cheap enough that I went and booked two seats for myself so that I could sleep more successfully on the overnight trip, and it was well worth it to me. The main annoyance on the trip were the rest stops, and the very annoying Burmese pop music blaring over the speakers. Thankfully they turned off the music sometime around 10 or 11pm.

The Aung Mingalabar bus station in Yangon was unlike anything I'd ever seen when we rolled in at 4am. Crazy, crowded and chaotic. I didn't stick around for long, but it basically seemed like a large field to me with an insane number of buses and cars all over the place.