Replying to Help me build a computer.

I want to build a PC soon. What I want to do is grab a 46" HDTV and hook up the desktop sort of as a media PC, but also, if need be, a gaming PC. I probably won't play many games on it but it would be nice to have the option. I'll mostly use it for watching downloaded TV shows / movies, hockey games through nhl.com. Also for browsing teh interwebz when I'm not using my laptop.

I haven't really kept up to speed since I haven't built a desktop since... like 5+ years ago. So I'm not sure what I'll need processor-wise. I'm thinking I'll want 6-8 gigs of decent memory, a good but not top of the line video card (~$150-200), a blu-ray player, and... what? HD space is probably not an issue since if I max out I can always just add a 1TB external.

So my questions are, I guess,

1. Does this idea even really make sense? I think it does but maybe there's some good reason not to do it.
2. What processor should I be looking at, and what speed?
3. What do I need to know to pick the right memory setup?
4. What are good video cards for my purposes?
5. Somewhat unrelated, but anything anybody can tell me to help me pick a TV would be appreciated since I know relatively little about that, I'm trying to find a 42-46" HDTV that'll be good for ~4-5 years, but have little grasp of terms like "contrast ratio".
6. Anything else I should know?

If there's a substantial benefit to stepping up a bit in price I'm okay with that but I really am looking for something that's good value and will do the job, not something that'll develop sentient thought or support a national intelligence agency.

If anyone can help me out with this stuff I'd appreciate it. Salespeople just want you to buy shit and that'd be the other major source of info I have.

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