I would leave your system as is - it's a pretty decent system. The exception to this statement is if you want to enter the realms of overclocking. Which is what the product in the Toms article is all about.
And to get "noticeable" performance, you will need to get into the 2100/2400 range, and that's a pretty heavy overclock.
IMO, you're ok. Save your money for your new rig down the line.