The best thousand yuan acoustic guitar to buy in the United States is the Yamaha FG800. This model is highly regarded for its quality, sound, and affordability. The Yamaha FG800 is a solid choice due to its well-crafted construction, which includes a solid Sitka spruce top and nato back and sides. This combination ensures a rich, full-bodied sound that is suitable for both beginners and intermediate players. Additionally, the FG800 is known for its comfortable playing experience, with a well-balanced action and a comfortable neck profile.

The Yamaha FG800 has been a popular choice among guitarists for several reasons. Firstly, it offers excellent value for money. According to a survey by MusicRadar, the FG800 is consistently ranked as one of the best-selling acoustic guitars in its price range. This is due to its combination of quality craftsmanship and affordability. Secondly, the FG800 has a reputation for being durable and reliable, making it a great investment for players who want a guitar that will last for years.

Furthermore, the Yamaha FG800 has been praised for its sound quality. A study by Acoustic Guitar magazine found that the FG800 produces a clear, bright tone with a good balance between treble and bass frequencies. This makes it suitable for a wide range of musical styles, from folk to blues and rock. The guitar's solid top also contributes to its projection and volume, which is particularly beneficial for live performances or when recording.

In conclusion, the Yamaha FG800 is the top choice for a thousand yuan acoustic guitar due to its combination of quality, sound, and affordability. Its solid Sitka spruce top and nato back and sides provide a rich, full-bodied sound, while its comfortable playing experience and durability make it a great investment for any guitarist.