What tv and components are best for streaming videos

My mom is thinking about getting a 46 inch Samsung (looking at the LN46C650 or UN46D6000) and either a dvr or a blue ray player with a hard disk. She also wants surround sound. Is it necessary to buy a TV with internet or can she just use the blue ray player. Do any of these come with a hard disk? If the tv is wi-fi ready, what does this mean?

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Clarification Request
"streaming videos" & "internet"

The real trick is, determining what your mom wants or needs, content-wise. She won't be able to access the entire internet w/o connecting a real PC or Mac to the display. Neither the HDTV or Blu ray player have hard drives, FWIW. They can however use built in applications to stream/access specific content from the internet, such as youtube, pandora or netflix, some of which involves paid subscriptions. She wouldn't be limited to an HDTV with 'widgets' as some Blu ray players have them too.

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Clarification on internet use

Thanks for all that information. We are both new to all these possibilities. She is not interested in access to the whole internet, rather just streaming Netflix and maybe access to some of the other features mentioned for these tv models like radio. The one Samsung model is wifi ready and requires a dongle. I am wondering if this is a one time purchase or a subscription.
If she gets a blu ray player, will this make any HDTV able to stream movies? Or does she still need the tv to have internet capability?
And lastly, can one actually stream movies with wi fi or do you need a hard connection? My iPad won't download movies over wi fi.
She is leaning toward the HT option for surround sound but is dependant on wireless speakers to avoid wires running across the room.

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Netflix is a subscription; dongle a one time purchase

99.9% of HDTVs will accept content from a blu ray player, including what's being streamed from the internet via a built in app. As I said previously, the Blu Ray can handle that part. The benefit of having an app or two built into the HDTV is that there's a chance it might work better than one from a connected component. This is always trial and error.

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