Hai, If U are Using it in home , then go for the Numeric 500 va or 600 va, Its a low cost UPS and will be better and economical for a PC. The Service is also good.
I will suggest you to use Microtek as it is more cheaper and reliable. It will be in the range of 1500 only for a single battery. And the size is also ok. Local brands not advisable as I used to both, once the warranty expires, they supplier disappears.