It's hard to make a serious mistake in today's dig cam market--lot's of quality products with a wide range of features, all at reasonable prices. You're already comfortable with Olympus and Amazon's always going to have competitive prices, so hit amazon.com with a search for digital cameras in the electronics dept, narrow the search to Olympus, and sort the resulting hits according to price (high to low.) Read the specs for a couple of cameras in the $300 range, and that will give you the high-end feature set. Then, decide which features you're willing to forgo in order to move down the price scale. When you hit the price range where your "must have" features begin disappearing, plan to spend at least that much. Before long, you'll have it narrowed down to two or three models. If there are insufficient owner ratings to make you comfortable, jump over to cnet.com and see what that site can add to what you already know. The cnet information will also list competitive prices--some of which might beat Amazon.
One feature that might not be on your shopping list (yet) is GPS. Some of the better cameras have a GPS receiver that will write Lat/Lon coordinates into the images files the camera creates. This can be handy when you're planning future fishing trips.
Happy camera hunting!