Is it necessary to upgrade right now, or in a few months?
AM3+ will be out in a few months and will really drop the prices on current CPU's.
Otherwise, the 955 is an excellent CPU, especially for overclocking.
The Asus board will be great for overclocking.
Patriot RAM is great, so 1333 MHZ and dual channel 2x2GB would be excellent for overclocking.
However, the 955 will not be very stable if you go over 1333MHZ for ram speed.
I won't be back on for a bit, so feel free to PM me if you still need help with anything.
All the best,