I want to upgrade my computer from my old C2D. I am retired and I use my computer 2 - 4 hours a day to surf the web, read emails and do some simple Word and Excel work. My needs are pretty basic but I want a FAST machine. Should I get a B75 or a Z77 motherboard? My priorities are stability and reliability board. I want USB 3 and SATA 3.I do not plan to overclock. CPU will be an i3-3225. I have a preference for ASUS and Gigabyte.