The processor ships with a heat sink and fan . You must use it , or an aftermarket model . For your purposes you can safely stick with the AMD model .
Your case looks entirely appropriate . It looks good , will have plenty of space since you are fitting a m-ATX motherboard , and the cooling is adequate for this build .
If you added a graphics card later you would also add more fans to move cooling air in to the case .
The memory ......... its hard to tell . Llano wants memory that runs at 1.5 volt or less and Im fairly sure those are 1.65 volt . Llano also benefits from having higher memory frequency since the graphics use this memory too . Unless you are editing videos or using a 64 bit image manipulation program [ adobe CS5 ] you dont really need 8 gig .
G.SKILL Ripjaws X Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1866 MHz $50 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
What power supply you will need is dependent on whether you will add a graphics card later . For a general purpose pc you will never need to do that and can use a 300 - 400 watt psu
If you add a graphics card later then its smarter to look at 500 - 600 watt units
What ever you use it should have a feature called " active PCF " .
If it doesn't have that its junk
I really appreciate your answer... I'l take all that into consideration... I was watching the memory you suggested, and I must say that I want to have this PC almost unchanged for at least 4 years.
Is frequency so critical in Llano, will going from 1600 to 1866 MHz that good?
How about this 8gig G.Skill Sniper
I sometimes use PhotoShop and I want to use AfterEffects... I'm just a begginer, nothing pro or from college, just me and a little creativity time
Something I forgot to mention is that I would like to do some gaming(e.g. Dirt 3, Assassin's Creed, Battlefield 3)... Would I be asking too much, without the discrete graphics card?
EDIT: Another thing, for example if I take the 2x2GB memory, can I later add more memory(e.g. 2x4GB, or will it accept just 2GB modules, as it uses dual channel architecture and they'll need to be 1866MHz)?
Everything is a compromise of price and performance so where you draw that line is up to you , and will depend on usage . If you play games more then I think less faster RAM , if you multitask more then more slower RAM is the solution