Both Dee and Cuda have raised some good points: what are your objectives for the camera? If you want excellent optics and topside use, the Olympus and Canon cameras with their relatively inexpensive housings are unbeatable for the price. They're also good for getting prints above 5"x7", sometimes to poster size. However, they've got a lot of buttons to fiddle with underwater, and if your purpose of shooting shots u/w is just to show your friends via email or 4"x6" prints some of the neat critters you've seen, then the SeaLife cameras should do fine for you. My first u/w camera was a SeaLife 100 (1.3 megapixel). It was simple to use underwater, and the bayonet mount lenses were easy to use as long as you "focused" properly with the distance wand. I took the photo of the goatfish and butterflyfish in my avatar with the SL 100. After about 6 months of getting used to taking u/w photos and improving, I was ready for an upgrade, so went with the PT-010 Olympus housing ($190) to house my D-3000 and now D-4000. These cameras have way more functions, and if you're not familiar with them on land you'll have even more taskloading underwater.