Niv,
I would imagine that those have been discontinued, but FWIW I have not had a good experience with those cards. They are extremely unreliable, with a tendency to stop working for no apparent reason.
I don't know what type of "sensitivity" you're looking for, but you can find the Connect+ on-line for less than $25 (Froogle it). I'd think the prism3 chips would have at least equal (if not better) sensitivity than the prism2's.