I bought a 27" curved monitor that I needed for business only to find that I need an HDMI port which my current CPU does not have. When looking at refurbished CPUs w/ an HDMI port, there appears to be about a $100 difference between a CPU w/8GB ram, a processor speed around 3GHz w/ intel core i5 (these are selling for around $200) and the same CPU w/ intel core i7( these are selling for around $300). Is going from i5 to i7 worth the extra $100?