Wow, that's a lot of good advice in this thread, plus some completely over the top advice too
So really, someone is just starting out as OWD and all of us (most likely including the OP) still have not too much of an idea what's his/her diving future has in store.
And already $1000 dive computers, $1300 drysuits and equipment a friend makes and that is not on the market is being suggested? Hm...
Oh well, never mind...
To the OP, I would look into getting a wetsuit for Bonaire that fits well, 3mm sounds good to me to start off with and they don't cost much. You will also need booties and of course a good mask and fins (I would prefer blade fins like Mares Avanti).
The rest of the equipment (bc, computer, regulator(s), tanks, weights) you could try to rent until you are sure you know what you want.
Obviously for cold water diving, you will eventually need a dry suit. Do a little research on a British company called Seaskin. They make very nice suits, made to measure, at way under $1000 that will outlast suits like the Pinnacle.
The Scubapro BC you mentioned looks to be very good. It has integrated weight pockets and I see nothing wrong with it. Others have mentioned a backplate/wing combination. That's another good option, BUT it may require additional instruction or mentoring to even get it set up properly, and of course to dive it.
As to the regulators, I would recommend looking into sealed regs that will work well in cold water. Personally I like Apeks regs, but Scubapro are nice too.
As most shops will be able to service Scubapro, that may be a good option.
The dive computer depends on your preference and if you would like one that is air integrated, which I'm not a friend of. If you buy the XP that has been recommended and end up selling it for something more advanced, you won't lose much money. And besides, if you do technical dives later on, you'll require a backup computer anyway and the XP will be fine for that purpose.
You might also consider getting a good DSMB so you can shoot a surface marker if needed. This is a skill you should learn, if not already in OWD, during your AOWD dives. It makes sense to own an SMB later on because many places don't have them for rent, plus you will be most familiar with the type that you own and use.