Choosing a sub in Delhi

In India the choices are few and far between. Help me you enlightened souls - I have to buy a Sub.

Choices in my budget are:

Yamaha sw215
and also sw315
Wharfedale pc10a
Boston pv350
Sony wm500

A bit further out of budget are also:

Mordaunt short 907
Boston pv500
Jbl e150 (double the price of the sw215)

Room 15 x20 feet, stone floor, minimal furnishing. 70% action films, 30% rock music.

This is my first separates system. I have a yamaha rxv450, pioneer dv575, Jbl e30 fronts and ec25 center. Am considering buying Jbl control1x for the surrounds - currently using old Sony from previous system.

Btw there is also an Indian company that makes subs - Sonodyne - but they're not cheap, and oh, what would my friends say ?

So what say YOU, forum people ??