I wanted to buy those HTDZ HT-81 cheap Chinese microphones on eBay (for £25) http://www.ebay.co.uk/itm/170514849437, but then I came across this listing http://www.ebay.co.uk/itm/400291825801 for HT-81A (notice the new "A"), which is supposed to be a "Professional upgraded version of the HT-81", and it seems to have slightly different Frequency Response: 80Hz - 20KHz (as opposed to 100Hz-16KHz), and comes with different cables then the HT-81. Price is double... £50.

So my question is: is it worth getting this "upgraded" version for extra £25? Is it worth the extra cash? All I want to do is to plug it into my Zoom H1 and get a clean dialogue sound.
So which one should I get? HT-81 or HT-81A ? Also any tips about good and cheap cables for the boom pole, would be greatly appreciated.