Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
$1200 seems pretty high to me. That's probably about what it would run new I would imagine (I'd have to sit down and price things out, which I'm not going to do since I'm not personally interested). But I bet you could get $800 for it. Again, it's going to be hard to find someone to buy everything. Masks in particular are a hard sell without being able to try on, and most people probalby aren't looking for all those things at once. I would at least separate out the weights, as that is going to add a lot to shipping. You could probably get more for individual components by separating, otherwise you'll probably have to discount the whole thing more to account for the fact that it's really unlikely you'll find someone that wants everything.
One person says $1200 sounds OK, the next said maybe $800 is better ... so if we split the difference = $1000 for everything