Actually, it would be cheaper to get an Ivy Bridge CPU, such as this one, to match the original MOBO plus then you would have the latest equipment instead of last generations.
The SSD that whs suggested would be in addition to the 1 TB drive you listed. The idea is to install only your OS and programs on the SSD, making it a boot drive, and keep only your data on the bigger drive. Using an SSD for a boot drive will allow your computer to boot and open programs faster than a mechanical drive without the expense of an SSD big enough to hold everything. Data drives don't need to be as fast as an SSD unless you are frequently moving huge amounts of data. The 64 GB SSD whs suggested is very reasonably priced. Cutting your RAM down to 8 GB as suggested by whs would go a long way toward paying for the SSD. Unless you run some really huge programs (such as seriously hard core gaming), 64 GB should be plenty for the SSD. 8 GB should be plenty for the RAM unless you plan on doing some really massive video editing, editing huge numbers of photos at one time, or industrial strength multitasking.