get the 400, it will be plenty by itself, teh 280 may be sufficient, maybe
but....
the 400 adds one other benefit, more circulation you want to have 550 gph circulation in your tank, MINIMUM, most reefers eventually end up getting 20x (which would be 1100 gph), so the added circ. will be an added bonus by itself, you can achieve teh other circ by adding powerheads, and also if you have a skimmer that will add to it
HTH
Oh yeah, Thor, if you are adding powerheads dsb and lr(even if later on), as we discussed earlier I would save teh money for your lr or something else, the extra 400 would be more money than benefit to you
[ December 16, 2001: Message edited by: fshhub ]