Hi all , newbie here . Had been using laptop for past 10 yrs and stil on core 2 duo n win7. Tinkin to upgrade to a desktop but most likely getting a shop to buy parts and install. Can advise the below ? Mainly using for surfing , YouTube , watching movies , mayb light gaming , AutoCAD etc. Ideally the setup can be upgraded in future , and budget around 900-1200. Pls advise the parts and shop to buy and install . Thanks