You've still got a few big questions to ask yourself.
Do you want a "Plasma screen"? An "LCD TV" (flat, like a monitor, but not "plasma")? A "traditional" TV? A projection system?
Plasma systems used to have horrible "yields" off the manufacturing line (i.e. most of the ones they made wouldn't work at all), so the prices were high. Yields have been improving, so prices have been coming down ... but the expected lifespan of a Plasma Screen TV is still only a few years (maybe five years), compared to a traditional TV which you'd expect to last about 10 years or more.
LCD TVs are okay, but tend to show different "artifacts" when displaying fast-motion images (e.g. sporting events). Plasma screens also have "artifacts", as do traditional tv's, but the "response time" of LCD TVs is more likely to be an issue than with the others.
Traditional TVs are hard to "mount" on a wall or from the ceiling, once they get to be a certain size. They need the space behind the set, and can be heavy and bulky.
Projection systems are my current personal preference. You can get almost any size picture you want, depending on how much space you have to place the projector. And whatever resolution you want is likely available. But then you have to decide whether you want a screen (yes, for the very best picture; projecting onto a painted wall can be okay, but it's not The Very Best); HDTV or Standard Definition TV (SDTV); how much light will be in the room when you're watching; do you want a "colour wheel" (where each of the three colours are projected sequentially) or simultaneously using LCD techniques (a small percentage of the population can see a "rainbow" effect with the colourwheels); etc.
If you decide to investigate projectors further, check out:
http://projectorcentral.com/
They have a decent reference for projector systems ... check out the info they show in their "Buyers Guide".
Also check out the "Learning Resources" link under ...
http://avdeals.ca/
http://avdeals.ca/classroom/learning_resources.htm
Don't go with "mass consumer" products until you've done the research to be satisfied that what you're getting is what you want. Usually, it won't be.
And, by the way: if you're concerned that these "projectors" don't have Television Tuners, you can always use an external box for tuning, or for converting signals to either Composite or VGA for input to any of these systems. Heck, I'm using something like these with an old computer monitor for one of my TVs:
http://www.cdw.ca/shop/products/default.aspx?EDC=978936
http://www.cdw.ca/shop/products/default.aspx?EDC=846136
http://www.cdw.ca/shop/products/default.aspx?EDC=620243
... although you'll probably want something with HDTV resolutions (e.g. 1080p, as opposed to standard resolution 480i or 525i, or "early" Hi Def sets at 720p, or 1080i ... "I" is "interlaced"; "p" is "progressive scan")