GhislainG :
600VA is enough, but the 480W will provide more backup time. Since they all are inexpensive UPS, buying one that exceeds your requirements is cheap insurance. For a 600VA I would consider this APC: http://www.flipkart.com/apc-back-ups-600/p/itme9udcqfebevwe?pid=UPSE9UDBHVFCTUAC&al=XoqxX5xtze6K9AvuYMyqlcldugMWZuE77x17v9FMUplNO6o7uzg9EeAYLUo%2FY78zvdAGO6rJIDM%3D&ref=L%3A-5842796897800532899&srno=b_1 On paper the less expensive Champion Home & Office 800VA UPS has better specs.
That pretty well sums up my question, thanks to all of you guys for the effort and I've decided to go with Champion Home & Office 800 VA UPS
Thanks to all of you, by the way how can I close this thread 😀😀