Really on this build you don’t need much processing power for Internet and Office applications, heck you could get away with an Intel® Desktop Board D510MO which is running a dual core Intel Atom™ processor. If you are looking for some better horse power then the Atom, I would take a look at the Intel Core I3 2100. The Intel Core I3 2100 is a dual core processor that can support up to 4 threads. Otherwise it looks like you have a nice set up for a low cost system.
Intel Enthusiast Team