What flash to get

The camera I use is an old Olympus Trip 35. I might get something decent
later - I use a measuring tape to focus it. It has a PC socket and
f-stops. I'd like to get a flash for it so I can take decent photos in
my house -  diffused, bounced, off-camera flash so should I get
        1. a flash gun, if so, should I avoid dedicated ones, or what
        should I look for?
        2. a basic studio flash - mains or battery?
        and do I need a flash meter for either of these?

Looking for any thoughts because I never used a flash before and don't 
want to get anything stupid. Have read photo.net and Strobist but am 
still not sure.
-ALAN
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pix.ie/alan