I'm going to tell you a story. When I eventually decided to upgrade from my very nice jacket-style BCD, the next logical option was to go with a backplate/wing, because it's very configurable, and you can swap parts, it's more reliable, etc. It's generally what tech-divers use, but is perfectly good for any recreational diver.
However, about 3 weeks later I discovered "sidemount" diving, and soon after acquired some equipment and training, and haven't back to backmount since. Sidemount uses a completely different equipment setup and configuration. My rather nice dual-bladder backplate setup, with a fantastic harness, etc has sat in a box since. I don't regret my purchase because I was able to build the setup fairly inexpensively, and I still have it as a loaner, or if my sidemount rig has a problem.
I agree about buying quality, but also keep in mind that your preferences are very likely to change. With your complete lack of experience, buying equipment now seems silly, and very likely you'll end up in a buy-twice cry-twice scenario. That said ,people here can probalby guide you towards equipment that will generally be good from an initial recreational-level up to early-to-mid technical diving. For example, you should probably go for a backplate+wing setup. Regulator-sets can also be reconfigured, and some are better-or-worse for certain environments like salt-water or cold-water diving.
I also believe in the "buy once, cry once" principle, as well as not having to re-learn stuff (muscle memory).
If you do go far into scuba, I strongly suspect you're not going to know which kinds of gear is the right gear to buy once. You can ask around here on SB to get some great advice, but for the moment, I STRONGLY recommend you just use the dive-shop gear, especially if the rental gear is provided at no additional charge (it often is). Consider it a free tryout of the rental-gear. There may be times, when you're traveling and don't have your gear with you, but want to do a scuba-dive, and you'll have to be able to deal with the rental-gear anyway.
Swapping between various backplate setups isn't really that challenging. As far as muscle-memory, that's somewhat valid, but not that big of a deal. Namely, I like to have my backup-regulator ("octo") always in the same place. I also enjoy customizing my setup to better suit me. You sound like you may enjoy that customization as well. Some of that is learning what kinds of setups you do like, and others is learning what kinds of setups you don't like.