I would go with a fluval 304....more filter than you need, but you can never have too much current, filtration in a salt tank, especially if you want to have a reef. I think they have a newer version of the 304 out now. :notsure:
They are quiet, easy to run and maintain.....a big bonus, you will be changing the media every 30 days. I have one (404) to run carbon, phosphate media etc. Just rinse the filter foam out and reuse, or keep back up foam pads for quicker cleaning. I absolutely love these canisters. I ran one (304) on my 46g salt tank for years, no problems. I haven't had any problems with this one either.