Hi,
I am looking at getting a modern, digital light meter, too. Have seen lots of Sekonic L-558 going on ebay but the Sekonic web site doesn't list them... Does anyone know if it is worth going for the old model L-558 or is it better to pay more for the L-358 or even L-758?
Is my thinking right that going for the L-358 or L-558 is better than the L-308S in the long term as they do averaging of measurements which the L-308S doesn't? Any other features you would miss if you had to use a L-308S instead of the L-358 or higher model?
Robert, I see you have the L-758DR. Do you find you need the top of the range or was it a "just because you can" purchase? 
To put it in other words, if I get the L-358 or L-558 will I wish I had gone the whole hog to the L-758 in a years time?
Thanks a lot in advance!
Best regards,
Anton