Welcome to the forum and to Havanese.
You're gonna love him/her!!!
As far as your list is concerned, it is certainly comprehensive! However, unless you LIKE to spend lots of money, I would back WAY off on the grooming stuff for the time being. It will take several months for your baby's coat to need more than a quick run-though with a comb, and a flea comb for around his eyes. You won't need more specialized grooming tools for a while, and you won't need serious clippers, even if you choose to keep him in a puppy cut, until he is 5-6 months old. I got a pair of small, quiet, cordless trimmers for horse whiskers at the tack shop for $20. These work great for trimming feet and "sanitary" trimming... at 9 months I haven't needed to replace the AAA batteries yet.
Every Hav has a slightly different hair type, and it seems that different combinations of shampoo and conditioner work best on different dogs. I certainly wouldn't be buying gallon sizes until I'm SURE I liked the brand... something you probably can't decide with certainty until your pup has his adult coat. I use Bio-groom shampoo and conditioner on Kodi, and a 9 months, we've gone through 2 1/2 small bottles of each. And that's with weekly regular baths, and foot/tummy baths as needed in between. A gallon is going to last you for years on one puppy, and if you find it doesn't work well on his coat type, it's wasted.
As far as your choices of scissors are concerned, you might do much better price-wise going to a local shop that sells to human hair dressers. (I asked my hair dresser where to go!) I got very sharp, excellent scissors and thinning shears for much less than the prices on your list. They are much better quality than the first pair that I got from a dog grooming supplier, and I was able to hold them in my hand and make sure I liked the balance and "feel".
A couple of things I see missing from your list are a restraint system for the car... either a car seat or a harness (unless you plan on crating him ALWAYS in the car), cozy bedding for his crates and a few nice big stuffed animals (without button-type eyes or noses) for him to cuddle with while he's small. Make sure the stuffed animals and crate liners are easily washable and dryable. I made the mistake of buying just one cheap-o one, and the stuffing all bunched up the first time I washed and dried it, rendering it useless.
Good luck with your puppy, and budget a lot for toys and "chewies".
I find that I spend a lot more than I really need to because I can't resist bringing him home something "special" when I see it.