New Tank setup.... suggestions?

[spikehs]

Hey all,

I haven't had a reef for a while (around 8 months now). Now that I am done school, and have a job, i figure its time to set up a new tank. I would love to get some suggestions and comments as to what i have proposed.

Tank: 48w x 24h x 32d (~160gal) - Starphire front/sides
- External overflow(s) I want to have 2 to minimize the risk of floods, is this overkill? what size holes do you think would be good to get?

Lighting:
Dual 400w, quad vho canopy
http://www.aquariumlight.com/product_info.asp?dbid=252

Calcium additions:
- I am going to put a kalk reactor right away, then add on a calcium reactor when/if needed

Protien Skimmer:
Not sure on make/model, but this will be added around 6months down the line (or sooner as funds permit!)

Flow:
2 x Rio Seio M1500 Pump 1500gph
~800gph return pump... this is a big question for me, whats a good amount of flow to have going through the sump (Assuming it will be around 50-75gal). I should have about 20x turnover total...

I am still toying with the dimensions... what is the longest do you think I could stretch the length of the tank and still have good coverage? I won't be having lots of coral on the sides, I just want to have an even looking coverage... thanks!