BB is spot on as usual. He knows what he is talking about.
I would 2nd getting the newer SLC's ( either the HD or the now called WB model) over the older EL. Coatings are a little better and a little brighter- probably due to coatings and glass improvements. In fact, for my preferences I would get the newer SLC's over the EL Swarovision; and that is what I have now. I used to have the SV's; and I personally like the format of the SLC's better.
Also if you are going to go used- the SLC's IMO go for a very reasonable price. For alpha glass, they are a great value- new or used.