I agree that leaving the overflows and doing a little bit at a time would be your best bet, it will pay off for you in the long run. It doesn't have to be brand new stuff either, and you can likely get alot for free. Great deals are easy to be had on the market place here on CR and the "reef clubs" on facebook, and don't forget Craigslist.
A quality skimmer is very important, there can usually be found for around $150 give or take on this very forum. 1000rrstunna has a 40b for sale now for I think 50-75$ and I saw a 50b on here for $50. There was also a 30 in the pif section last week.
Silicone and plexi is gonna cost around 50-75. Plumbing about the same, all at home depot.
A submersible return pump (magdrive) can be had new for<$100.
What kinda power heads are you running? Jeabo WP series are pretty popular and affordable, <75 but I just picked up nib koralias at reef plus for $80.
Ebo jager heater is like 45 or so at aqua pros.
Are you a reef keeper or FO guy? Big reef needs big light, this is what separates the men from the boys. Is a 110 four feet or six? Leds or mh you will need two fixtures to get adequate coverage with four footer and three for a 72" dt.
Reef crystals are gonna cost $100 just to flip the power switch, and do you have an RODI?
Umm what else... Don't forget about a stand, a 110 is gonna weigh in at around 1000 pounds with the sump so think sturdy.
Have fun and good luck, shop smart.