ElectricZombie once bubbled...
I would lose the snorkeling gear. I hate to snorkel, but that's just me. I would also lose the console...too big and sloppy.
I think he meant mask and fins, not just a snorkel. Are you going to dive with no mask and no fins on SCUBA?
My opinion is, get the equipment in order of how much it will affect you if it keeps changing on you(i.e. renting).
So,
1. Mask, fins, snorkel
2. Exposure suit (You have already said you have these two)
3. BC : the BC is going to make the most difference in terms of how you carry yourself underwater. Every model has different characteristics that takes getting used to, and the fit is very important to be comfortable.
Now the next depends on what you plan to do, and there are two cases, A and B.
Case A: You are going to rent and use a computer anyway if you don't have one.
Computers are good for recreational diving, as it's quite conventient and will let you make the most out of varying dive profiles. (Of course, you still need to use your brain and plan the dives.)
In this case, I would say get the computer next, since every computer will be different, and it will take a couple dives to comfortably make sense of what it's telling you. If you are renting, it will add to task loading when you are trying to figure out what it's saying. If you are getting the computer only, a wrist computer will work best.
Case B: You will use tables if you don't have a computer.
This will be much cheaper, but you might be a little constrained on some dives, as many other people will be on computers. Many tech divers on this board will push for this, but IMHO, for recreational diving a computer is real nice, although not essential. If this is what you want to do, then don't get a computer until you have everything else.
So, for the two cases:
Case A:
4. Computer
5. regulator/console
(If you get a wrist computer, then put only an SPG on it and get a wrist compass. This is what many people think work best. The other way is to combine 4,5 and put the computer in the console, or get a air integrated computer, which some other people prefer.)
Case B:
4. Regulator/console
Although a regulator is a very important piece of gear, if you rent at a reputable place, it will be pretty much the same. There may be differences, but it will not affect you as much as struggling with a poorly fitting BC, or puzzling over an unfamiliar computer (for case A, only).
Knives, lights are relatively much more affordable, so you can get them soon. It is good to have at least one cutting tool early on. EMT shears are pretty cheap and work really well.
The rest depends on what you plan to do. If you mostly travel to dive destinations, don't get the tank and weightbelt, but look into a travel bag. But it's quite possible that a good hard suitcase will work, for much less, and will be less of a target for thieves.
If you frequently dive locally, then it does make sense to get the weightbelt. Whether or not to get tanks will depend on how many dives you do. Compare the savings from getting just airfills instead of tank rentals, with the purchase cost of the tank plus annual visual inspections plus the quintennial hydros. If the dive store is a little out of the way, owning tanks, even if it's more expensive, may make sense, as you can make just one trip to get air fills instead of two visits, to rent and then return the tanks.
Another consideration.. If you are diving locally, a 7-person trip with all the dive gear and two tanks each, may require some significant cargo space in your vehicles.