Who makes a good in-ceiling speaker for surround sound?

Amin wants to know who makes a good in-ceiling speaker for surround sound. Scott has multiple suggestions of companies that would make good speakers for this:

• MonoPrice
• Definitive Technology
• Golden Ear
• Origin Acoustics
• Speaker Craft
• Polk

All make great speakers and they work really well with Dolby 5.1 surround sound systems.