Which 6" subwoofer for me??

I really would like a JL 6WO but can't find them to often. So I was looking at these??? I have read about the Tang Bands Tang Band TB W6 1139SG subwoofer Woofer 6 5 in Only One speaker REDUCED | eBay and have really considered those too. But then I saw these on ebay Aura 6" Neodymium Magnet Woofer | eBay and they looked similar to the TB's. These are going to be used for sub woofer duty. Looking for something small for the wifes cars.

Thanks
Justind