What type of frags are you planning on keeping/growing? The general rule of thumb is around 50 times turnover rate of the DT for SPS (random flow is best). On a 75 I would run something like 2 MP40's for an SPS system (or Jebo WP40's for the budget... you could probably even do 1 Jebo WP40 b/c of the amount of flow these things have!).
I believe LPS are around 30 times. Softies are even lower (10 times I think?). I'm not sure on softies as I don't really keep them =).
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Duncan
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