I m using svs pb1000 and I have tested in my living room which is 22x22 , it just filled my room . I kept 70 percent of volume at -4 db .Best suits for movies and for music its not wow ,but above average. Give a try .
Assuming it's an AVR, you should use the "pure direct" or similar mode for music. In which case the sub goes out of the equation. Even otherwise, I don't think you really need a sub for music with your speakers.
In your budget and specs, only the SVS would fit. You can get some auditions in Bangalore.
You can also try BIC America F12 which is a 12 inch 475 Watt and other model is BIC America H-100II which is a 12 inch 500 Watt sub. They also go down to 25 and 24 Hz respectively.