I am kinda in the same boat. Just got serious again about the hobby and upgraded everything. MH to T-5 (if i would have waited a little longer may have gone to LED), went to better skimmer, better powerheads with wave maker, no wet dry all live rock, better return pump, sump serperated with heigth staggered baffles, led light in sump for Cheato, auto water top off new, all new filters for water filter system and new bowfront tank and stand.
The point of all this is, with all these upgrades the one that stands out the most is the water top off system. I bought a perastolic pump in combination with an electronic timer and float swith to replace evaporated water (RODI of course) with kalk. Seems fairly geekish to me but that is friggen awesome to me. But let me tell you, life is so much easier. I just have a seperate tank with mixed top off water and the worst chore of maintaining a tank is over. I have it set to add water for fifteen minutes every hour at night until the float swith is happy. Tank is new but happy and I only have to add top off water once every 3 weeks and monthly water changes.
Good luck with the new tank!!