It's all quality stuff, but then most gear out there is pretty high quality - top of the line often means more features, not necessarily more quality. More features are good if you use them, if you don't it's just clutter that gets in the way. For regs top the line will likely breath easier but you may not be able to tell the difference from the mid range. It matters more that things are suitable for you.
- Do you know that BC will fit you well? That's about the most important thing to look for.
- The Cobra is a good computer, but there are many less expensive computers that will do the job just as well. Air integration can be nice but it's also a feature you might want to skip if you're on a budget. (You don't even need a computer right away, let alone an expensive one.)
- As far as the Air Source. some people like combined inflator/alternate units, others don't, and it's worth understanding the pros and cons. Again, this is a situation where you could go with a standard inflator and standard octo for probably less money (though, you might get a deal on a air source from someone who didn't like it and wants to get rid of it.)
- As far as the Spare Air, there are zillions of threads on this - basically this is a device originally designed for getting out of, say, a helicopter near the surface that's ditched but most people do the math and say it does not contain enough air to do you much good at depth when scuba diving. It gets marketed to divers, but that's marketing for you. So it's something that's perhaps not very useful, that you certainly don't need, so might be another good thing to skip if you're on a budget. (Though again, you might get a good deal from someone dumping one of these.)
Deals can be had places like eBay, but be aware there's many offers that aren't such good deals especially when you take everything into account, and its more difficult as a new diver to know which is which. You might be able to get some idea of condition from pictures, and you can ask the seller questions like why they're selling, how old, used how much, salt water or fresh, when serviced - but unless you know the seller I'm not sure you can trust any of that much or know anything for sure until you get it checked out.
