Hi Benen, you've certainly picked out some nice gear. It's what the mainstream thinks of as lightweight gear. There is however, a whole world of small gear makers offering significant weight savings AND no loss of durability or functionality. In fact in many cases their products are MORE functional and exhibit very high levels of craftsmanship. Here are a few:
Packs: ULA has several packs that would suit your needs. Quite comparable to the Aether 70 is the ULA Catalyst, a pack that Chris Townsend considers the best of the "lightweight load-haulers." Nice pack, built with Dyneema Grid so it's super-durable, twin aluminum stays, an awesome hipbelt, and features useful to trail hikers. It's much bigger than ULA's specs would have you believe. Price is pretty reasonable at US$250, weighs 47oz.
Tents: Henry Shire's Tarptent line is highly regarded on this site, and for good reason. There really is noone who builds the range of light tents that Henry does. For two man tents, you can have a really light single wall tent with the Double Rainbow at 40 oz., or a really tough, light double wall tent with the Scarp 2 at 54 oz. The Scarp 2 would also allow the option of setting up the fly only. Tarptents are spacious, well ventilated, handle winds well, and are light compared to almost anything else. They're also priced fairly; the Double Rainbow is US$265, the Scarp 2 is US$325.
Sleeping Bags: This is where you'll spend some money. You will also have these for a long time if you buy something nice, so it's worth spending a little more. Have you checked out Montbell bags? Highly regarded and priced a little cheaper than Marmot, the UL Spiral Down Hugger #1 is rated at 15F, filled with 20 oz. of 800 fillpower down, total weight is 32 oz. Price is US$329.
Stoves: You can make an alcohol stove from leftover food or drink cans, so it's basically free. You can make a really light cookpot out of a Foster's can with a side-cutting can opener. A light canister stove can be bought for less than US$40. The alcohol setup will save you a pound, the canister stove 8-12 oz. This is for a weekend trip. The weight savings with a canister stove on a long trip is even more dramatic.
Check out the reader reviews for even more examples of really light gear.