I am clueless about what subwoofers are the best for my budget.

I have a £150 budget for two 10 inch subwoofers and a car amplifier.
I have a power supply sorted which can take up to 800w.

I know I wont get much for my money but there is so many cheap subwoofers on sites like ebay, Im not sure which are rubbish and which might be half decent.

Any sort of help would be great!
Thanks!