I also started out on a Ranger BC. Turns out that I didn't do nearly as much cold water diving as warm water, and as many people do I quickly learned about streamlining and backplate/wing setups as I got more experience. They really should do a better job steering OW students towards BP/W setups, or at least educating them about them. Anyways...
A few years ago I replaced my Ranger with a Dive Rite Transpac XT with the travel wing, and it's fantastic. Highly customizable, comfortable, relatively affordable. Does everything you need it to and nothing you don't (based on which accessories you attach). Yes you can buy a metal backplate, wing, and DIY a webbing harness for a couple hundred $ cheaper, but the transpac is nice because it cuts out the labor and is a complete package that will fit and work (though an aluminum BP+harness/wing setup is also an option if you want more rigidity). Much more streamlined than my Ranger was. 44lb of lift was extreme overkill in the tropics with <10lb of lead. More compact and easier to pack too.
For regs I finally just recently upgraded my 20 year old Zeagle regs from when I started with a Scubapro Mk17Evo2/s620Ti/R105 set. Also took the opportunity to go to DIN (another thing they should really steer OW students towards...). The Mk17 is basically just a sealed Mk11 with a slightly higher price tag, and either would be fantastic choices. Both are relatively light and compact for travel. Scubapro is one of the big boys and is probably one of the easiest brands to find parts for worldwide.
And yeah, I also had issues recently getting Zeagle regs serviced. The part kits are generally available, but not necessarily in stock everywhere like the bigger brands are, so service time can be longer and emergency repairs more problematic.