Echo Park 0°

Without knowing much, I'd almost always favor the colder rated bag. You can always vent if you get too warm, but once you get too cold, it's hard to recover. That being said the Greystone is down so much lighter and packs smaller, very useful if you're backpacking and space/weight is more limited than car camping. Echo does have a cotton/poly blend internal lining which would also be more comfortable compared to straight poly like the Grey. If you can deal with the weight/packed size of the Echo it gets my vote.

Baselayers!!! Midlayers!! Outerlayer! Wool socks. Baselayer as a Dry suit for sleeping Thermal Sleeping pad. Big Agnes Lost Ranger 0F Sleeping Bag $$ you are going to spend some cash money. It's like crack.

I went rei big Agnes, but I also have 2 (20 year old) down bags that I put inside each other that can keep me just as warm and combined they are as small and light as big Agnes but with down moisture is the enemy and in winter there is plenty so there is that

30” wide sleeping pad of your R value needs and choice, and a big Agnes echo park (or similar) bag. The bag attaches to the pad to you can move all over all you want and the bag stays in place like a lightly tucked in blanket on top of you.

I just think $400 per item is a solid budget for really nice, comfy, quality stuff and people are recommending you essentially raid the camping aisle at Walmart. I’d check out Big Agnes Spicer 4 or 6 for a tent. I love the 6 but it can be a little large depending on where you’re putting it. I’d check out Hest for sleeping pads. That’s what I’d have if they were in my budget. So comfortable! I also love the Nemo roamer XL and some exped pads too. I’d stay away from air mattresses (cold, bulky, less comfortable) and backpacking pads (thinner, sometimes noisier, less comfy) too. For sleeping bags I’d consider going back to big Agnes. I don’t think you need to spend the $400 per item here since it’s just car camping but I honestly love my big Agnes echo park sleeping bag and use it a ton car camping. I can’t stand mummy bags so that’s a backpacking only thing for me. North face makes some other good options and so does Kelty in terms of car camping. I’d probably recommend a cotton liner so it’s really easy to take out and wash. These can be bought seperate from the sleeping bag. If I had a $400 budget to cook I’d totally get some sort of nice flat grill, probably a blackstone. Something that disassembles well and fits in the car would be sweet. I’ve also seen a couple of recommendations for jackery and that’s another good example of a budget brand where you probably don’t need to be buying the budget brand. Anker is far superior in quality and there are plenty of batter options in your budget. I’ve had TONS of camp chairs and really can’t find a better chair than the Kelty lowdown. Kelty isn’t necessarily known for their quality but they’ve got chairs figured out. I’ve had good luck with quite a few lanterns so it might be worth shopping around for features you like, but I liked the black diamond Apollo probably the best of any I’ve had.

The lack of filling on the one side in the bag you mentioned is because the side you lay on (against the sleeping pad) will be compressed so much as to be generally useless as insulation. Cotton is a bad idea for anything intended to maintain warmth. I like the suggestion of the quilt and sheet made earlier.

I love my Echo Park, but it's heavy.