flash unit or buy a faster lens? I think this could be answered by either Olympus or non-Olympus users..Newbie to photography and have a zuiko 14-42 f3.5-5.6 lens that's pretty good outdoors, but hunts terribly in low light. Would it be wiser to put money towards a flash unit, or buy a used zuiko 14-54 f2.8-3.5 or sigma 18-50 f.2.8 lens? I use this camera for family functions and really just need a way to take faster/better multi-purpose indoor shots. Also have a couple family weddings coming up and would like to be able to take some decent shots at them.