Hi everyone, I am a 30 y.o. accountant from Hong Kong and now want to buy the first Mac in my life, i.e. 2012 Mac Mini. Although my budget is not tight, I want to save money to purchase thunderbolt HD (which will cost me a few hundred USD). I found many useful posts here and hope experts here could kindly answer a few questions, thanks a lot! 1) I have read the Geekbench results (http://www.macrumors.com/2012/10/24/early-impressions-and-benchmarks-on-apples-2012-mac-mini/) and understand that 2.3GHz i7's performance is well above 2.5GHz i5. But does that mean much to me as a user who: a) download HD movies from web, watch and copy to external hard-drives as backup frequently; b) check mails, browsing the internet, low level excel work c) does not play pc games often (i play xbox) 2) I decided to try 4GB ram first and see if upgrade to 16GB is needed. I saw many people here mentioned about OWC, and then Crucial. I need the most reliable brand because I don't want to ship back malfunctioned RAM, not even one time. Which brand should I choose? Thanks a lot!