I have a Core 2 Duo 2.26 with 4GB and a 7200 RPM HD. I use it for browsing and light video/photo. Windows 8 is a little slow and OSX is too slow for me. should I upgrade to 8GB and an SSD? or is that money better spent towards an I7 with an SSD? ...and does it matter on my machine 3gb/s vs 6gb/s SSD? Thanks for any advice.