Don't get an X2 right now unless its one of the lower ones becuase of budget. The First CPU you linked is a C2D and is a very sick processor indeed.
As for the speakers why not downgrade your CPU to an E6300 as they are in the end about just as fast for 40 bucks and you wouldn't notice the difference. This will give you extra cash and enough for these.
Thats a nice little system right there
EDIT: The power of an E6300 stock is like having two 4 GHZ P4's running. You'll notice a difference. Although I highly suggest you overclock them just a little bit even and you will get much more power.