Yes, ask what wing you are getting. There is no "standard HTS 2 wing". HTS 2 is just a harness. Better to know what you are buying with your money, right?
However, if you have caves or wrecks in your future,, HTS2 is probably not future proof. You want some get in to bp/w setup for back mount. As for reg, I am just not a big fan on Hollis, speaking from my own experience with DC2/212. It is not a popular brand amougst the tech/cave divers. You may save a little money going with them. But if you ever need to sale them and get something else, the resale value also reflect that.