SFF HTPCs? Can it be done and meet my specs?

So I really don't want a bulky box sitting next to my flat screen. I'd love something that I can mount to the wall behind the flat screen. Because of that, I'm looking for small.

My needs:
1: Stream 1080p movies from NAS: Wirelessly.
2: Play Blu-Ray rips from my collection.
3: Play Music from my collection, Spotify, and Pandora
4: Access Netflix/Hulu/Internet

Wants:
5: Ability to stream Cable TV through it. (Ditch Qworst/Clink/Comcrap Box) - I don't have a DVR, I have just the regular cable box. I'm not sure if I can route this through the HTPC to get DVR capability while still having the TV Guide ability.
6: Ability to use a Remote Control on it (Keyboard for internet)

Bonus:
If there is room for a DVD or Blu-Ray drive, that would be a bonus. But that is very easy to sacrifice, as I have ripped my entire DVD/Blu-Ray collection onto my NAS so I can watch it through my WDTV currently. (Sadly, the WDTV can't handle BluRay-> MKV rips.)

Because I have NAS, I don't need a huge Hard Drive. I'm not sure how small a graphics card I can get away with to still play Blu-Ray / 1080p. Nor am I sure how small a Mobo I can get away with while still having enough Memory to do this. How small can I make this thing?

I am *slightly* willing to accept a larger box if I can completely remove the Cable Qwest Box, the DVD Player, and the WDTV all in one fell swoop, leaving the HTPC and the Wii. I live in a Studio, so space is a premium.
Edited by Kaeth - 5/5/12 at 12:16pm

This is all great advice.

Two last questions: Is there any "Bottom end" on processors I should stay away from? Is an i3 or a small generation behind going to be ok?

Also: Are there any TV Tuner cards that can handle both Digital Cable and Satellite Cable, while preserving the functionality of "TV Guide?" For example, right now, I'm on the Clink/Qwest bandwagon, but it's presumable when I graduate college that I'll move to somewhere where I'll have to switch to Comcast. I understand that I may have to buy a different card, so, for now, I'm willing to cope with a card that can handle Satellite. Preferably DVR capable, two-channel.

Thanks!

At the very least, is there a "Box" that I can purchase? This thing that Qwest gave me is a behemoth. They don't charge me for it because it's an old version, but it doesn't have DVR and it is huge. Are there third party vendors that sell "smaller" boxes?