I joined a Olympus user group back when I got my C5050. The group is still going and has moved on to the current dslrs.
They have a website
Here with camera and lens information.
As to what lens that depends on how wide you want to go. What was a wide lens for a film camera is usually nearer a std lens on a dslr with its smaller sensor. So your best bet may be to find a shop that will let you put the lens on your camera for you to see.