I wonder if 5150 means the same back there...
Anyway, I can't justify using a wetsuit someone else has peed in. Although I don't consider the wetsuit to be the most important piece of gear, I just want to be the first to 'use' it.
First you breathe, then you float - in my view.
After you resolve the wetsuit issue (I assume one is required for local diving), the next item should be your regulator. I'm not all that keen on putting something in my mouth that has been elsewhere. Sure, I can change the mouthpiece but that just isn't enough! Used regulators can be fine but make sure to have them serviced.
There are cheap BCs around. Check LeisurePro. As was pointed out above, you can rent them when you travel. I'm kind of out of the BC thing and heavily invested in BP/W's so I would only recommend what I like and that is the Deep Sea Supply BP/W. Maybe you need to wait a bit on this one. You can always rent locally.
I like the DiveRite Nitek Duo computer. It's on sale now that it has been superseded. See
Dive Rite Express is now Dive Gear Express. It's a very capable 2 gas computer so it will carry you a long way in diving. Whatever you do, have the sales person demonstrate how to use ALL of the functions. Some of these computers, particularly the one-button models, have a menu system that only the programmer's mother would love.
You can do square profile dives with a watch, depth gauge and tables. I did well over 100 dives this way before I ever bought a computer. Even then, I only bought it because Nitrox gets a bit complicated when you have to accumulate your oxygen exposure.
Richard