I seriously doubt $3400 is a good deal regardless of what's in the package.
If I were to try and outfit a new single tank OW diver:
*Used SS backplate, STA (if needed for wing chosen), cambands, and one-piece basic harness:
$150-$200ish (these are just pieces of metal and some webbing - you can tell their quality and condition just by looking at them and warranty and service/support are not important later on, so buy used and save 50-75%).
*New 30ish LB wing from Halcyon, DSS, or Oxycheq (pretty much in that order, depending on budget):
$300-$500 (used wings are simple to screen and repair but you are new to this whole thing - a solid warranty will ease your mind should you get a defective wing). Halcyon has numerous dealers and will also work with you directly; the owner of DSS will work with you directly (and lecture you at great length, but that won't hurt you at this point); Oxycheq support is hit or miss (to be nice about it) but they make great wings.
*New Atomic Z2 yoke unsealed first stage and two Z2 second stages, plus a 5' hose and a 22" hose + necklace:
around $700 for regs+octo (buy them wherever you find the best deal online, so long as it's an authorized dealer...because
you can always call Atomic directly if there's a problem, no dealer required. You won't have to service them often; AA suggests every 2 years but most of us just monitor them ourselves and only service/send for service when they show signs of needing it. A reputable LDS will do an annual inspection for you for a very nominal fee, though doing it yourself is not hard and doesn't require any real disassembly. AA's warranty is not continent on servicing on their schedule, either.).
Add another $100 or so for a good brass & glass SPG on a 26" HP hose.
If you want to spend a few hundred more, get the B2 and sell the swivle; if you want to spend a lot more, get the ST1 and sell the swivle. I consider the Ti regs a waste of money compared to the ST1, but whatever you like. For the love of all that's holy, do not buy any reg because it has "free parts for life"
Because of your type of diving, I say skip sealing and diaphram regs. Finally, I should note that buying a good used Atomic reg set plus a separate 2nd stage on eBay or here and then having AA do a factory rebuild on it might save you some money. Not nearly as much as buying used and just inspecting yourself, but it gives you basically a new AA reg for about 2/3 the price after factoring in used prices and AA factory service. Depends on your budget, really.
Sub-Total:
$1,250-$1,500, and you have great support for everything except the metal hardware that makes up the BP/harness part of your BCD.
Computer...it's your call. If you want to buy once, cry once, get a Shearwater Petrel, put it in Rec OC mode, and you're set forever. Another
amazing company that you can deal with directly, not going through your LDS. Still, there's no need for you to spend
$850 for a computer! Just realize that if you're going to go much above $300-$400, I think you may as well go whole hog. There are lots of perfectly fine rec computers in the $200-$400 range, but that's about where I'd set my limit for a non-Shearwater computer.
Your LDS is a great place to get gas fills, have tanks inspected/hydroed, and get classes. I don't see much point to using them for anything else. YMMV.