I second the Infinity's. Great sound for the money. With ceilings that high you definitely need high output, I would also look at JBL as they are known for their output. If you like aggressive music (rock, rap, etc.) and action movies/games they are a great choice.
HD-DVD: 55 / Blu-ray: 83
newest: Brotherhood of the Wolf / The Raid 2, Book of Life
AVR: Marantz SR6006
F/C/R: Polk RTi A9's / CSi A6 / Speakercraft AIMWIDE 3 / Sub: SVS PB12-NSD
Samsung PN58C8000 Samsung BD-P2550, Toshiba HD-A30, SA 8240HDC, Xbox360 Elite, PS3, WDTV Live