that's true, the housing costs almost 300 when i last checked but if u have the intention to go deeper the next time, it is ok to invest a bit more . Btw, the oly also need to get a u/w housing when going beyond 10m so really no difference unless u r sure u going to snorkel only for the lifespan of the camera. haha. but on the other hand, getting the oly should be safer lar. coz housing flood also camera should still survive (based on theory, anyone want to try at 30m?). haha
Average pns with own brand housing can cost $600-$800. Get fuji F31fd the high iso is useful in case you do not want to spend additional cost on strobes and arms support.
It has uw mode which make the photos color vibrant and saturated. Black and white mode for specials photos. Can put in the BCD pockets in case and battery comsumption can last 4days.