Please advise on sub selection

So...
I am looking to get a sub.
As I live in Asia, choices are limited (no HSU/SVS/Outlaw etc).
I've narrowed down my choices to the following according to availability and budget range. Room size is (3.5m * 5.25m). Playing time will be about equal between movies and music. Please advise.

1) ML Dynamo 700
2) Paradigm DSP3100 or 3200
3) Paradigm Ultracube 10
4) Paradigm PDR 12

I am leaning towards the ML but I'd appreciate some input about usage experience.

BTW, is the ML Dynamo made in China or US? And should I be worried?

Thanks.

What are your main speakers?

my mains are audioengine a5

I am sorry but I am not familiar with those speakers.

Well let's say that I have a pair that you know of (mid sized bookshelf)...

I went to tha Audioengine web site and didn't see the A3. However the site showed a subwoofer that is designed for its monitor speakers.

Sawatdee Krup Khon Abooboo,

The ML Dynamo 700 is made in China. Should you be worried? China has been moving to higher end manufacturing over the last decade and in many areas their quality has improved. However, I don't know the particulars of this model.