We have a Big Agnes something or other 15 degree down bag we bought for around $300...10 years ago. It's great, although more like a 30 degree bag. Size / weight is about equal to two sleeping bags.
We also tried out Feathered Friends' Spoonbill which is well out of your price range but might be interesting to look at to see how an actually warm two person bag looks.
So the problem with any normal two-person sleeping bag is that there's an air gap between you if you don't sleep snuggled up. The Big Agnes we have has a small flap that covers that up. We have also stuffed clothes in between us when it was colder. That works for 15 to 20°, but not colder.
The reason I said the spoonbill was interesting is that it has individual draft hoods for each person so you share warmth but actually can't cuddle.
I have a Big Agnes lost ranger UL which is a 2 part system, one of which is like you describe, the other a regular bag, or you combine both for maximum insulation.
I think going all in like this is a bit much personally, but I do have a zenbivy sheet and quilt, and I found that for the specs etc. the value wasn't awful when I purchased, at least for backpacking equipment factoring in weight etc. For moto camping alone, it's a bit overkill.
Breaking it down a bit:
I think the pillow looks a bit overpriced, but if it's super good maybe not awful. The mattress also looks a bit overpriced to me - compared to a similar Nemo or Big Agnes. The dry sack is overpriced IMO, and not really necessary unless you don't have waterproof luggage. I just pack my quilt in wherever it'll fit to take up all the extra space.
The quilt itself I think is pretty solid, 10° is pretty cold but maybe makes sense depending on where you're located, and the integration with the sheet is super nice IMO.
The Big Agnes lone/lost ranger are competitive options that are priced generally similarly for context.
These were all over the industry a couple of years ago, but have fallen out of favour, and I actually can't find any current single-bag, adult sized offerings by a major company that are made this way.
The Rab Mythic Ultra 120 "modular system" is now discontinued, I believe, but would be the most UL uninsulated bottom option.
The BA Lost Ranger is an actual modular system consisting of two bags, a fully insulated mummy bag and a backless/pad sleeve style outer rectangular bag
I have a Big Agnes single I LOVE so I’m jealous of all the folks here with the double. We have a flatlands fleece double bag and the Klymit double pad because they were the easy buttons through our wedding registry. The bag packs large for my taste but the pad is perfect. We sleep on top of each other at home and love snuggling all the same in the wild. Unless your trips are all ultralight backpacking, it’s quite cozy and romantic!
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