Tanks should be your last buy if at all, I use 80’s for boat dives but 72’s for shore dives.
You need to do the math, how many local dives, rent vs own, will you ever recover the price of the tank(s) plus the hydro and VIP cost?
When I drive to NC or Florida I take my tanks which helps offset the cost of ownership but I probably don’t want to look at what that extra 130 pounds is doing to my MPG.
Renting a computer is a bad idea, I took a loaner on a dive trip because they were collecting data for DAN and misread the time remaining putting me into a deco that I hadn’t planned for!