I have a PC with a 1000W rated power supply (gaming machine). I want to get a UPS protection for the desktop. Which one should I get
it would depend on what exactly you would use it for (other than the obvious) If you just want something that can safely bring the system down after an outage, then somehting like this will do:

http://www.newegg.com/Product/Product.aspx?Item=N82E16842101006
this one is more expensive, but you can run the system at full load for a few hours off of it:
http://www.newegg.com/Product/Product.aspx?Item=N82E16842106119