there is somany ways i could re do it.
what is the with and hight and length of the 70g
what do you want to do with the tank ie what kind of corals do you want to keep?
i went from sps lps to soft zoas
i think i would get t5 HO for lights and not MH = heat = chiller this is one reason i asked the hight of your tank.
i think i would of bought the best skimmer becuse after buying 6 different ones i could of put that money in to the best one.
right now i am looking at power consumtion my eletric bill is big do to what i am using so now i am going threw a phase of lower watts ie pumps run 24/7
so in the long run that expensive pump may cost less "in the long run"
drilling my tank there has been diffrent times that i wish that i did more than less i did a close loop and now i want to put a drain in to my tank "not a u tube and over flow" i wish i would got a Ecotech Marine VorTech Propeller Pump with Wireless Wave Driver this pump would run your hole tank and it is low watts less power. the vortech also has a batt back up that would of saved me 500.00 in the long run just in fish when my power went out when i was not home. have a qt tank and put my fish in there.
i would be more of a but head like when i buy a car and make the lfs feed the fish so i can see that they eat and are not going to die in my tank. "you are paying them to work there when you buy your fish so make them work 4 u.
if they say that they just fed them tell them to do it again with one flake of food or less this time or to put it on hold 4 u untill they feed again and you are there.
i would buy used equiptment from people you konw or trust.
i would make my own stuff also i wouldnt pay 400 for a sump with bio balls and over flow i would make my own it would be a lot cheeper in the long run
i would look on line and at the lfs for the price b4 u buy it
well that is my 2 cent hope it helps
or in the long run you can buy a high deff tv and dvd player and get them dvd with the reef in it that why you will not look like a crack head buying all this fish stuff b/c once you start you get hooked lol