1 - The Abit AB9 has integrated sound ("7.1 CH HD Audio" from the abit website). If you can get a close up on the motherboard,
like this (link) you can see the female part of the connections at the very top. One blue and one pink. As far as sound quality goes, it might be passable. Depends on whether you need okay sound, great sound, or as true to life as possible sound.
2) It might. I'd let someone else check it out though!
3) Case should fit everything. Just check to see if you have the right amount of PCI slots for your TV tuner and eventual graphics card. As far as cooling goes, it looks like a front intake for an optional 120mm fan, a basic rear exhaust with 120mm fan, and from the picture I found it looks like it has a side vent. A fan might be optional there as well. Can you verify the case though? I was looking at the Cooler Master website and found this little note:
Quote:
I/O Panel USB 2.0 x 2, MIC x 1, SPK x 1
Does NOT support HD Audio
|
which might cause problems with your motherboards integrated sound. Maybe it just needs a different I/O plate or a hole cut out?
link -
http://www.coolermaster-usa.com/Products.aspx?pid=1250