Battery charger question

[Dave C]

MArk,

You wrote "CTEK is really worth the money.  GREAT battery chargers."

I'm just about convinced to spend some $$ on one of these, but find
they offer various models.  Which model(s) do you have experience
with, and which would you recommend?

I see the 3300 can be had for ~$60, but the 4.3 and 7200 also seem to
be worth considering,

 http://smartercharger.com/battery-chargers/#CTEK%20Multi%20US%203300

Dave C.