About a year ago I started a similar thread and got good info , then went on the welding web and got more info with a difference, over there you need to emphasize that you are a hobbyist and you're not making money off your O/A rig, everyone (with good intentions) direct you to get the biggest tanks, or get multiple tanks to lessen the chance of ever running out. bigger is always better over there.
I on the other hand as a retired fitter/welder only needed the biggest tanks I could own , not rent, that's the big difference, if you are more like me and just want to braze here and there , heat cast iron for small brazing projects, then in my opinion you are better off going to your local welding store and buy the biggest size tanks from them that you can own, and when you run out, drive there and give the empty ones back and get a full one, that's all there is to it. if you don't want to ever run out of either gases, get a spare tank(s)later.
As for the torches, find places that repair /clean torches and ask if they have a USA made set for sale, it will be money well spent , or buy a new set, just don't buy Fake Victor, smith, Harris as others pointed out,..
For you information, I had a chance to buy a seemingly good used rigs for $450-$550 but paid $710 locally and got a new victor and two tanks with their name on the bottles. for $200 more you will have a great set without worrying about hydro-static tests or ,LWS exchange policy and so on.
I'm not saying do what I do ,just letting you know to buy new torch/supplier's old buy to own-tanks is an option .