Ever since I have had my 13" MacBook Pro (it is a mid-2010 purchased in July 2010) it has shown the spinning beach ball often and everything has hung for roughly 45 seconds before then carrying on as normal. I was planning on doing a fresh install with Mountain Lion as the problem had persisted when I upgraded from Snow Leopard to Lion. My friend suggested that I put in an SSD instead as it will make it much faster generally. I know a fresh OS install will make it faster than it currently is but I am quite tempted to go with an SSD while I am at it to make it faster still. After doing some research, I am still unsure on what to go for. I would like to spend roughly £150 ($235) but I would pay up to £200 ($315). I am looking for roughly 250GB (which I understand to be 240GB on some models and 256GB on others). Based on reviews I am considering the Crucial M4 (though Amazon has MANY and I would not know which to choose) and the Sandisk Extreme Sata III, both of which are linked below. http://www.amazon.co.uk/gp/product/B006EKJ8UI/ref=ox_sc_act_title_2?ie=UTF8&smid=A1AUCPBF2P18HS http://www.amazon.co.uk/gp/product/B004W2JL2A/ref=ox_sc_act_title_1?ie=UTF8&smid=A3P5ROKL5A1OLE Please help me with my decision. Many thanks, Dom.