Congrats on your certification!
The ScubaPro regulator you list above is a solid regulator. You won't be disappointed with them. My ScubaPro reg is my secondary and my primary are my Apex. As for service, neither of them are cheap, but it costs me a few bucks more to service my Apex regs.
Buying your regulators and computer first and then later getting your BCD isn't bad. You get an opportunity to then try different BCD like everyone above is suggesting.
If you have your own regs and computer, you can travel and rent the rest of the stuff. You can get a regulator bag that is the size of a tiny briefcase. Keep this with you as carry on in the plane. Also, you know the history of your own regs.
Personally I'd avoid the AI consul computer and go with a wrist mount. There are a variety of reasons. I low vis I found it was harder to see a consul. If you want to try someone elses reg set up, they may be willing to part with their regs, but not their computer if they are using a wrist mount. I found it was easier to keep an eye on my depth, dive time, dive time remaining (NDL), & deco obligations when your computer was on your wrist and easy to see. The AI is nice in a computer and you can get wrist mounts that are AI as well. The Dive Rite Nitek Duo is a nice little computer at a good cost and if you start diving with two gases, it will grow with you.
Personally I'm not a big fan of the AIR 2 things. It takes practice to breath out of one of those things and manage your lift as well. I don't even like the conventional octopus system and it's teaching. My secondary reg is worn on a short hose on a necklace around my neck while my primary is on a 5ft hose that is routed under my right arm, across my chest, around the back of my head and to my mouth and that is the reg that I will donate. Also I sling a pony with it's own reg as a redundant air source. A Spare Air can also sort of meet this need.
When you try out various BC's try the whole BP/W thing. They are versatile and are surprisingly comfortable. Something that I do not think was mentioned above was that the BP removes some weight from weight belt. A SS plate is 5-5.5# and that is less weight on your waist and puts it on top of your lungs. It helps with trim.
Good luck in your endeavors!