Which One

Hi Guy's, which one would you guy's advise me to purchase. My choices are : Octagon SF8 or Opticum AX Odin or finally Technomate TM nano, all a similar price. At the moment I'm using a Amiko 8140 but I want to get into the E2 side of things.
And of course money is tight. Cheers guys.

Thanks for the quick reply, I notice that if I were to choose one from the forum sponsor it gives me a choice of image to be installed. Have you any idea which one would be better than the other. I understand it's about personal opinion but being new to E2 scene it's a bit confusing.