Congrats on your new family member and kudos to you for preparing so efficiently! I have a couple of comments about your Amazon Wish List. The Hide-A-Squirrel toy is a great idea. My pup, Max has Hide-A-Bee toy and it keeps him busy. He loves playing with it. While I don't have familiarity with the Puppia harness I've heard wonderful things about it.
I'm not sure about the Heated Console Seat and the heating component worries me a little. I'm not sure how necessary that is. I'm a huge fan of the Lookout car seats. I have 2 size medium in the back seat of my car for my boys. They do also have console seats if you prefer that. Here's the medium:
Amazon.com: Pet Car Seat - Lookout I Medium...
I can't help so much with the gate, but are you just needing this for nighttime sleeping? What about a playpen? This is the one I have (size large) and I'm thrilled with it. There's plenty of room for comfort:
Amazon.com: Orange Pet Dog Tent Puppy Playpen...
And if you have any money left, I'd add one of these to your shopping cart:
Amazon.com: Skinneeez Stuffing Free Dog Toy Fox:...