Forum pros! please judge my htpc build!

I am building a htpc for:
-watching .mkvs
-streaming videos
-watching cable+OTA channels
-very light web browsing
-no blu ray drive for now but eventually upgrade to watch blu rays

Here's my proposed build so far:
CPU: AMD Athlon 64 X2 5050e

Mobo: Narrowed it down to 2 780g mobos
1. http://www.newegg.com/Product/Prod [...] 6813128379
2. http://www.newegg.com/Product/Prod [...] 6813131324

(i saw proximon suggest a 760g mobo to someone else. should i stick with the 780g or get a cheaper mobo?)

Ram: G.SKILL 4GB DDR2-800 (already bought)

HDD: Samsung EcoGreen 1tb (already bought)

Case+PSU: waiting for a good deal on case/psu like the antec nsk2480

TV tuner: Hauppauge 2250
http://www.newegg.com/Product/Prod [...] -_-Product

don't really know anything about them. Whats the difference between using the comcast cable box or a TV tuner? Other than not paying for one... It wouldnt be a huge deal to switch inputs. Do i get a better picture? More DTV channels? Are there any other advantages worth paying $150 for? I dont really care for recording stuff as I can just download/stream tv shows i want.

GPU: HD4550
http://www.newegg.com/Product/Prod [...] 6814102819
or just use the hd3200 on my mobo?

Im planning on using the W7RC MC for awhile then switch to retail next year.

Feel free to make ANY suggestions. I would absolutely appreciate it. (esp the tuner+GPU)

I'd get the Athlon II. For $27 more, it will give you much more performance.
http://www.newegg.com/Product/Prod [...] 6819103681

Not really. They're both rated at 65W - the Athlon II is 45nm, which allows better performance-per-watt. It should run at a similar temperature, but perform much better.

ive decided to not get at tuner for now. However, I have been having a very hard time finding a good case. I already got the antec EA 380, but can't seem to find a case. Im hoping to spend about, but not too much more than $100.