Buy your TV from a good TV manufacturer (Sony, Samsung)
Buy your receiver from a good receiver manufacturer (Yamaha, Pioneer, Denon etc..., for bang for the buck, check out the Onkyos: The 606 decodes HD audio at a good price point).
Buy your speakers from a good speaker manufacturer (Bang for the buck: Polk, Athena, Infinity etc... stay away from Bose).
There is nothing to gain from keeping the same brand. There are standards that are common across the board such as HDMI 1.3, x.v. / Deep Colour, DTS-HD or uncompressed HD sounds from Blu-Ray sources.
Go for a receiver that can decode the HD audio signals from its HDMI inputs, and you'll be future-proof for a long time.