I'm not going to suggest what to get, but a couple of things to consider.
1.) The Pro Plus 2.1 is a well-regarded AI console computer. The Atomic Aquatics Cobalt is substantially more expensive, but the sheer intuitive ease of use & an internal rechargeable battery that should last several years are very nice benefits to me (I didn't like the idea of replacing batteries or paying to have it done, and regard the typical dive computer as about as easy to program as a digital watch, which is to say a confusing pain in the butt). To me it was worth the cost; to many people it would not be. Just say'in, check it out & see how it stacks up for you. I do at this point prefer to use an analog compass (which some Pro Plus 2.1 packages come with and some don't! Be careful!) rather than a digital compass (Cobalt), but I've not done a lot of compass work yet.
Note: Some people can master a typical dive computer's operation & retain that proficiency, perhaps with minor review before trips, over time and are comfortable with that. To them, paying hundreds for an easy, intuitive set of scrollable menus with words instead of abbreviations may seem ludicrous. To me it was a dream come true.
2.) Do some thinking about a wrist dive computer, either AI (e.g.: Oceanic VT4) or not (Geo 2.0). I didn't want a transmitter to change batteries in and have jutting off the first stage, personally, but a wrist unit is awfully nice to glance at to conveniently watch your depth, and a lot of people on the forum prefer wrist units.
3.) I don't recall your scuba boots choice, if any, but if you anticipate shore diving in Bonaire, get a pair of SeaSoft Sunrays (or equivalent) to protect your feet from the ironshore. Regular scuba boot soles aren't protective enough.
Richard.
