Rent some. Buy some. It sounds like you are comfortable with a jacket style BCD. There are hundreds of thousands of people who dive with these and are extremely happy. There are also at least a thousand people who like BP/W. It's up to you.
As far as regs go, there are several that are discussed on the board regularly for their quality, breateablility, looks, service, etc. etc. If I were in your position, I would list all of the "good" ones that are mentioned with their prices (new and used) and service pricing. Then I would pick one that you are "comfortable" with based on the feedback here on SB AND the price. I would get the best gear that you can afford. I would NOT buy a starter kit. If you get a good regulator, it won't get worse. I am breathing on the same regulator I bought in 1986. Maybe I'm lucky. It's one of the ones that are frequently highly rated here.
Bottom line is that I would rent for a while trying to rent what you think you may want to own. If you have access to multiple dive shops carrying multiple brands of gear, try to work with them to select the best for you.
Good luck -