I have to disagree with WyldFya about the Catalina lights. They are not Teks for sure, but they beat anything even close to their price range. I think their other products are lower grade than their lights though.
He is right about the filter and co2 though. Something else you can try for a while would be to use Flourish Excel instead of co2. A 75 gallon is pretty big for excel because it can get expensive buying the small bottles at the lsf. But if you buy the big bottles online, it isn't too bad. Then as your budget allows, you can get a good canister filter.
That is going to be a lot of light, so start kind of slow and make sure you have a lot of good plant growth before you really start adding a lot of light.
I think you are going to have a great set up. Good luck.