upgrading

[briano at olivares.com]

Hi guys out there
I know I come for last but at the end I bought a Cube!
Now it is my time to upgrade it. So I should need some
suggestions from you all for the components I have to
buy.
As Ram is already upgraded I need some good suggestions
on CPU telling me where to get it  (even the fan) and
where to find instructions (on paper or on video) to
install it (I live in Monaco where there isn't so much
expertise on this machine).
I really need also suggestions on the most reliable
60gb internal HD. 
Thank you in advance
Brian