I've got marine, and have had my tank for nearly 4 years. Two of my current fish have gone through two moves and survived ok.

It is expensive (i suffered an expensive loss of all fish when a new fish infected the whole tank), but i've kept the number at 5 fish and had these for some time now (no corals) - fish are only expensive if you keep buying them. Plus if you shop around for the equipment you can get some good deals. I don't skimp on the water though as i don't prepare the salt water myself (i tried once really unsuccessfully) so i buy it ready prepared from my local aquarium shop.

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